Clinical and Laboratory Differences Between Early-Onset and Late-Onset Adult Atopic Dermatitis

2020 ◽  
Vol 24 (4) ◽  
pp. 360-366
Author(s):  
Dae-Lyong Ha ◽  
Geun-Hwi Park ◽  
Hoon-Soo Kim ◽  
Hyun-Chang Ko ◽  
Moon-Bum Kim ◽  
...  
Keyword(s):  
Atopic Dermatitis ◽  
Early Onset ◽  
Age Of Onset ◽  
Late Onset ◽  
Severity Index ◽  
Total Serum ◽  
Significant Difference ◽  
First Onset ◽  
Onset Group ◽  
Early Onset Group

Background Atopic dermatitis (AD) in adults is not uncommon, and its prevalence has been increasing in the recent decades. However, there is a paucity of data about the differences between early-onset and late-onset adult AD. Objective The objective of this study is to investigate the clinical and laboratory characteristics of adult AD, focusing on the differences between early-onset and late-onset adult AD. Methods We retrospectively reviewed the medical records and clinical photos of 214 adult AD patients (≥18 years of age) over a 3-year period. We classified the patients into 2 groups: early-onset (first onset of AD before 12 years of age) and late-onset (first onset of AD at 12 years of age or later). Results Among 214 patients, 151 patients (70.6%) belonged to the early-onset group (mean age 24.5 years), while 63 patients belonged to the late-onset group (mean age 29.5 years). An association with allergic asthma or rhinitis, a family history of atopic disease, elevated total serum IgE, and sensitivity to food allergens were more commonly seen in the early-onset group. The late-onset group had a significant likelihood of nonflexural involvement (38.1% vs 13.2%). There was no significant difference in the mean eczema area severity index score, eosinophil count, and sensitivity to aeroallergens between 2 groups. Conclusion Adult AD shows different clinical and laboratory characteristics depending on the age of onset. This study could help to create awareness about the heterogeneity of AD in adulthood and encourage further studies on clinical outcomes and different therapeutic methods depending on the age of onset.

scholarly journals A Cross-sectional Study of Psychiatric Comorbidity and Severity of Addiction in Patients with Early- and Late-Onset Alcohol Dependence

2020 ◽  
Vol 42 (4) ◽  
pp. 334-340
Author(s):  
Anamika Das ◽  
Sujita Kumar Kar ◽  
Pawan Kumar Gupta ◽  
Pronob Kumar Dalal
Keyword(s):  
Alcohol Dependence ◽  
Early Onset ◽  
Late Onset ◽  
Severity Index ◽  
Cross Sectional Study ◽  
Addiction Severity Index ◽  
Cross Sectional ◽  
Addiction Severity ◽  
Onset Group ◽  
Early Onset Group

Background: Alcohol use disorder is a serious health problem with high comorbidities. Early-onset alcohol use has been associated with greater impulsivity, increased severity of dependence, frequent alcohol withdrawal complications, externalizing symptoms, and antisocial behaviors. We aimed to evaluate the psychiatric comorbidities and severity of addiction in early- and late-onset alcohol dependence. Methods: This was a cross-sectional study. All patients fulfilling the diagnostic criteria of alcohol dependence as per International Classification of Diseases (10th edition) were included in it. Semi-Structured Assessment for Genetics of Alcoholism IV was applied to find the age of onset of dependence as per the lifetime frame and also to find comorbidities. Composite International Diagnostic Interview 3.0. was used to find other comorbidities. The severity of addiction was evaluated with Addiction Severity Index, 5th edition. All the sociodemographic and clinical parameters were compared between patients with the early- and late-onset alcohol dependence. Results: Out of the 112 patients screened, 57 met the selection criteria, 26 were with early-onset and 31 with late-onset alcohol dependence. The patients were all males. The patients with early-onset alcohol dependence had a higher family history (P = 0.006) and were nonearning (P = 0.002) in comparison to the group with late-onset dependence. The comorbidity among all patients was 59.6% and 84.2% in current and lifetime frames, respectively. It was significantly higher in the early-onset group, both for current (P = 0.015) and lifetime (P = 0.031) frames. On the domains of Addiction Severity Index 5th edition, the early-onset group had a more severe profile of addiction in all domains except the medical domain. Conclusion: Comorbidity is high among patients with alcohol dependence and is even higher for the early-onset group. The family history was higher in the early-onset group and they have more severe profile of substance use.

scholarly journals Differences in Clinical and Dietary Characteristics, Serum Adipokine Levels, and Metabolomic Profiles between Early- and Late-Onset Gout

Metabolites ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 399
Author(s):  
Young Sun Suh ◽  
Hae Sook Noh ◽  
Hyun-Jin Kim ◽  
Yun-Hong Cheon ◽  
Mingyo Kim ◽  
...  
Keyword(s):  
Early Onset ◽  
Late Onset ◽  
Clinical Information ◽  
Plasminogen Activator Inhibitor ◽  
Ultra Performance Liquid Chromatography ◽  
Plasminogen Activator Inhibitor 1 ◽  
Baseline Serum ◽  
Onset Group ◽  
Early Onset Group ◽  
Pai 1

This study aimed to identify differences in clinical and dietary characteristics, serum adipokine levels, and metabolomic profiles between early- and late-onset gout. Eighty-three men with gout were divided into an early-onset group (n = 38, aged < 40 years) and a late-onset group (n = 45, aged ≥ 40 years). Dietary and clinical information was obtained at baseline. Serum adipokines, including adiponectin, resistin, leptin, and plasminogen activator inhibitor-1 (PAI-1), were quantified by a Luminex multiplex immunoassay. Metabolite expression levels in plasma were measured in 22 representative samples using metabolomics analysis based on ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry. Average body mass index, rate of consumption of sugar-sweetened beverages, and serum uric acid levels were significantly higher in the early-onset group (p < 0.05), as was the PAI-I concentration (105.01 ± 42.45 ng/mL vs. 83.76 ± 31.16 ng/mL, p = 0.013). Changes in levels of metabolites mostly involved those related to lipid metabolism. In the early-onset group, acylcarnitine analog and propylparaben levels were downregulated and negatively correlated with the PAI-1 concentration whereas LPC (22:6) and LPC (18:0) levels were upregulated and positively correlated with the PAI-1 concentration. Dietary and clinical features, serum adipokine concentrations, and metabolites differed according to whether the gout is early-onset or late-onset. The mechanisms of gout may differ between these groups and require different treatment approaches.

The Evolution of Dementia in Idiopathic Parkinson's Disease: Neuropsychological and Clinical Evidence in Support of Subtypes

1992 ◽  
Vol 4 (4) ◽  
pp. 147-160 ◽  
Author(s):  
Wayne G. J. Reid
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Early Onset ◽  
Late Onset ◽  
Age At Onset ◽  
Critical Determinant ◽  
Drug Study ◽  
Baseline Phase ◽  
Onset Group ◽  
Early Onset Group

One hundred and seven newly diagnosed, untreated patients with Parkinson's disease (PD) were divided into two groups according to their age at reported onset of symptoms. Of these, 79 patients were under age 70 (early-onset) and 28 patients were age 70 and over (late-onset). The group of 50 control subjects comprised spouses, friends of the PD patients, and community volunteers. The patients were participants in a multicenter drug study of Parkinson's disease. Each had received a detailed neurological and neuropsychological assessment in the baseline placebo phases of the study. Thirty-4 patients with early-onset and 12 patients with late-onset were reassessed 3 years after treatment with low-dose levodopa, with bromocriptine, or with a combination of the two drugs. The results of the baseline phase of the study revealed that 8% of the early-onset group and 32% of the late-onset group were classified as demented. The 3-year follow-up revealed that the prevalence of dementia had increased to 17% in the early-onset group and to 83% in the late-onset group. This study confirms that at least two distinct subtypes of Parkinson's disease exist. The subtypes differ both clinically and neuropsychologically. The age at onset of symptoms is a critical determinant of the rate and type of cognitive decline in Parkinson's disease.

scholarly journals Maternofetal outcomes in early versus late onset pre-eclampsia: a comparative study

2019 ◽  
Vol 8 (2) ◽  
pp. 548
Author(s):  
Poornima Shankar ◽  
Kavitha Karthikeyan ◽  
Amrita Priscilla Nalini ◽  
Sindhura M. ◽  
Gowtham Kim
Keyword(s):  
Risk Factors ◽  
Gestational Age ◽  
Early Onset ◽  
Age Of Onset ◽  
Late Onset ◽  
Fetal Outcomes ◽  
Chi Square ◽  
Onset Type ◽  
Significant Difference ◽  
Early Onset Preeclampsia

Background: Preeclampsia is being increasingly recognized as two different entities: early-onset preeclampsia occurring at less than 34 weeks of gestation, and late-onset disease occurring at 34 or more weeks of gestation. Early-onset and late-onset pre-eclampsia are found to have different implications for the mother and neonate. The aim of this study is to compare the risk factors, maternal and fetal outcomes in early (<34 weeks) versus late (≥34weeks) onset preeclampsia.Methods: 208 patients diagnosed with pre-eclampsia in Chettinad Academy of Research and Education over a period of three years (From January 2014 to December 2016) were retrospectively studied. Patients were classified as early onset and late onset pre-eclampsia based on the gestational age of onset. Data on risk factors, maternal and fetal outcomes were collected and analyzed using Chi Square and Fisher’s test and compared.Results: The overall preeclampsia rate was 6.3%. Early onset and late onset were 34.6% and 65.3% respectively and the rate increased with increasing gestational age.35.3% of patients with late onset preeclampsia and 55.6% patients of early onset type required more than one drug which is a statistically significant difference. Proteinuria more than 3gm/l/day was significantly more in late onset preeclampsia than in early onset preeclampsia. 55.5% of patients with early onset pre-eclampsia required MgSO4 when compared to 17.4%. There was no statistically significant difference in the rate of caesarean section (61.1% vs 73.5%). Altered coagulation profile was significantly more in early onset preeclampsia (11.1%). The incidence of oligohydramnios, SGA and low APGAR at 5 minutes of birth were significantly high in early onset pre-eclampsia when compared to late onset type.Conclusions: Patients with early onset pre-eclampsia are found to have significantly higher rates of specific maternal and fetal morbidity when compared to the late onset type.

scholarly journals Differences Ratio Level Soluble FMS-Like Tyrosine Kinase-1 and Placental Growth Factor Early And Late Onset on Preeclampsia and Normal Pregnancy

2018 ◽  
Vol 3 (1) ◽  
pp. 83
Author(s):  
Ria Andina ◽  
Yanwirasti Yanwirasti ◽  
Defrin Defrin
Keyword(s):  
Growth Factor ◽  
Tyrosine Kinase ◽  
Early Onset ◽  
Late Onset ◽  
Normal Pregnancy ◽  
Elisa Test ◽  
Placental Growth Factor ◽  
Cross Sectional ◽  
Onset Group ◽  
Early Onset Group

Preeclampsia is a major maternal morbidity and mortality worldwide including in Indonesia. PIGF concentrations were found to be lower and sFlt-1 to be higher in patients with preeclampsia than normal pregnancy. Futher, this factor has been proposed as a parameter that can help identify women with potentially preeclampsia.This study aims todeterminethe differences ratio level soluble rate fms-like tyrosine kinase-1 and placental growth factor early and late onset on preeclampsia and normal pregnancy. The cross sectional study design was conducted in RSUP M.Djamil, Rasidin Hospital, Reksodiwiryo Hospital and Biomedical Laboratory of Andalas University from July 2017 until January 2018. The sample of this study was pregnant women>20-42 weeks pregnancy totalling 80 people by consecutive sampling.Sample was divided into 3 groups. SFlt-1 and PlGF levels tested using ELISA test. Test the normality of data by Kolmogrov-Smirnov test by using unpaired T test.The results showed median sFLT-1 levels in the early onset group with normal pregnancy with p= 0,88, median sFLT-1 levels in the late onset group with normal pregnancy with p= 0,01 and median levels of sFLT-1 in the early onset group with late onset with p= 0.34. Mean of PlGF in the early onset group with normal pregnancy with p=0,30, mean of PlGF in the late onset group with normal pregnancy with p= 0.63, and mean of PlGF in the early onset group with late onset with p = 0.27. The conclusion of this study was that there was a difference ratio level Soluble Fms-Like Tyrosine Kinase-1 late onset in preeclampsia and normal pregnancy.

scholarly journals ANALYSIS OF THE ASSOCIATION OF BRONCHIAL ASTHMA CLINICAL COURSE WITH Arg16Gly POLYMORPHIC VARIANT IN THE β2-ADRENOCEPTOR GENE

2021 ◽  
Vol 17 (2) ◽  
pp. 70-76
Author(s):  
V.V. Kachkovska ◽  
L.N. Prystupa
Keyword(s):  
Bronchial Asthma ◽  
Early Onset ◽  
Clinical Course ◽  
Age Of Onset ◽  
Late Onset ◽  
Asthma Severity ◽  
Polymorphic Variant ◽  
Genotype Distribution ◽  
Significant Difference ◽  
Arg16gly Polymorphism

Relevance. The relevance of the study of Arg16Gly polymorphism of the β2-adrenoceptor (β2-AR) gene is due to the fact that a number of studies have proven its role in the development of bronchial asthma (BA), bronchial hyperactivity, the effectiveness of basic treatment. However, these associations show low reproducibility in various studies, so the question of the possibility of clinical application of the results of genetic testing for Arg16Gly polymorphic variant of the β2-AR gene remains unanswered. The main reasons why the clinical significance of this polymorphism is not confirmed in various studies are - population heterogeneity, insufficient sample size, improper characterization of comparison groups. Objective: to study the association of Arg16Gly polymorphism in the β2-adrenoceptor gene with BA clinical course taking into account the age of onset. Materials and methods. We examined 553 BA patients (group I included 282 patients with late-onset asthma and group II included 271 patients with early-onset asthma) and 95 apparently healthy individuals. The study has been approved by the Bioethics Committee of Medical Institute of Sumy State University. Arg16Gly polymorphism in the β2-АR gene (rs1042713) was determined using polymerase chain reaction-restriction fragment length polymorphism analysis. Statistical analysis of obtained results was performed using SPSS–17 program. Results. There was no significant difference in the distribution of genotypes for Arg16Gly polymorphism in the β2-AR gene depending on asthma severity with no regard for the age of onset (χ2 = 5.14; p = 0.27). With regard for the age of onset, we found out that early-onset BA was linked to a difference in genotype distribution for this polymorphic variant in patients with severe and non-severe course (χ2 = 14.76; р = 0.001). The frequency of Gly/Gly genotype was higher in patients with severe course (41.4%) as compared to patients with mild course (16.4%), while the frequency of Arg/Arg (32.9%) and Arg/Gly (50.7%) genotypes was higher in patients with mild asthma as compared to patients with severe course (24.3% and 34.3%). There was no significant difference in the distribution of genotypes in patients with late-onset asthma with regard to course severity (χ2 = 4.94; p = 0.084). The relative risk of severe course for early-onset asthma was 3.84 times higher (95% CI 2.11–7.36; p = 0.001) in the recessive model, 2.58 times higher (95% CI 1.53–4,37, p = 0.001) in the dominant model, and 2.16 times (95% CI 1.56–3.04) higher in the additive model. In patients with late-onset asthma, no association was found in all models. Conclusions. There was no significant difference in the distribution of genotypes for Arg16Gly polymorphism in the β2-AR gene depending on asthma severity with no regard for the age of onset. When adjusted for the age of onset, the analysis revealed a difference in genotype distribution for this polymorphic variant in patients with severe and non-severe course having early-onset BA (р = 0.001). The frequency of Gly/Gly genotype was higher in patients with severe course as compared to patients with mild course. For patients with late-onset asthma, no differences were found (p = 0.084). Heterozygous and homozygous Gly allele carriers have a higher risk of early-onset asthma only.

scholarly journals Timing of chemotherapy-induced neutropenia is a prognostic factor in patients with diffuse large B-cell lymphoma: a retrospective study

2021 ◽  
Author(s):  
Juan Qiu ◽  
Baoxuan Zhang ◽  
Bing Bu ◽  
Shu Fang ◽  
Lihua Song
Keyword(s):  
Early Onset ◽  
Cell Lymphoma ◽  
Late Onset ◽  
Independent Predictor ◽  
B Cell Lymphoma ◽  
Short Term ◽  
Term Efficacy ◽  
Large B Cell Lymphoma ◽  
Onset Group ◽  
Early Onset Group

Abstract Background Chemotherapy-induced neutropenia (CIN) has been shown to be associated with improved clinical outcomes in patients with various solid tumors. The aim of this study was to investigate the relationship between the timing and degree of chemo-induced neutropenia (CIN) and short-term efficacy and survival in newly diagnosed patients with diffuse large B-cell lymphoma (DLBCL).Methods A retrospective study was conducted on 236 newly diagnosed DLBCL patients who received at least 6 cycles of R-CHOP (like) or CHOP (like) between January 2012 and December 2018. According to the occurrence time of CIN, subjects were divided into CIN-absent group, early-onset CIN group and late-onset CIN group. According to the degree of CIN, they were divided into CIN-absent group, mild (grade 1-2) CIN group, and severe (grade 3-4) CIN group. Short-term efficacy was evaluated after 4 cycles of treatment. The Kaplan-Meier method was used to draw the survival curve, and the Cox proportional hazards model was applied to determine the correlation between the timing and extent of CIN and clinical features, short-term efficacy, progression-free survival (PFS) and overall survival (OS).Results After 4 treatment cycles, the objective response rate (ORR) of the early-onset group was higher than that of in the late-onset group and CIN absent group (95.7% VS 88.4% VS 81.0%). Multivariate analysis, Ann Arbor staging, choice of treatment plan and CIN timing were the independent prognostic factors for OS and PFS. OS and PFS in the early-onset group were longer than those of in the absent group [OS (HR:0.241; 95%CI: 0.110-0.530; P < 0.001), PFS (HR: 0.313; 95%CI: 0.169-0.579; P < 0.001)] and late-onset group [OS (HR: 0.332; 95%CI: 0.161- 0.685; P = 0.003), PFS (HR: 0.376; 95%CI: 0.204-0.693; P = 0.002)].Conclusions The timing of CIN is an independent predictor of prognosis in DLBCL patients treated with R-CHOP (like) or CHOP (like) regimens, and patients with early-onset CIN have longer survival times. The degree of CIN is not an independent predictor of prognosis in patients with DLBCL.

scholarly journals Age trajectories of disability in instrumental activities of daily living and disability-free life expectancy among middle-aged and older adults in Taiwan: an 11-year longitudinal study

2020 ◽  
Author(s):  
Wen-Ling Liao ◽  
Yu-Hung Chang
Keyword(s):  
Older Adults ◽  
Longitudinal Study ◽  
Life Expectancy ◽  
Early Onset ◽  
Late Onset ◽  
Remaining Life ◽  
Iadl Disability ◽  
Disability Free Life Expectancy ◽  
Onset Group ◽  
Early Onset Group

Abstract Objectives: This study aims to identify the age trajectories of disability in instrumental activities of daily life (IADLs) over 11 years and their correlates, and to estimate disability-free life expectancy for identified trajectory groups in middle-aged and older adults.Methods: We included 3,118 participants aged 50 and over without IADL limitations at baseline from the Taiwan Longitudinal Study in Aging, followed across 1996-2007. We used group-based trajectory models to identify age trajectories of IADL disability, and multiple logistic regressions to examine their correlates. Sullivan method was used to compute IADL disability-free life expectancy for trajectory groups at different ages.Results: We identified two trajectories groups: 67.7% of participants classified as the late-onset group and 32.3% as the early-onset group. Female (adjusted odds ratio [aOR]: 1.93, 95% confidence interval [95% CI]: 1.54, 2.41), not being employed (aOR: 1.30, 95% CI: 1,08, 1,56), poor/fair self-rated health (aOR: 1.31, 95% CI:1.09, 1.58), hypertension (aOR: 1.32, 95% CI: 1.07, 1.63) , diabetes mellitus (aOR: 2.29, 95% CI: 1.72, 3.07), arthritis (aOR: 1.42, 95% CI: 1.11, 1.81), stroke (aOR: 2.21, 95% CI: 1.04, 4.70), and one-point increase in a 10-item depression scale (aOR: 1.04, 95% CI: 1.02, 1.06) were associated with early-onset of disability, whereas higher education (aOR: 0.59, 95% CI: 0.42, 0.81), regular exercise (aOR: 0.76, 95% CI: 0.62, 0.93), and participating voluntary or club activities (aOR: 0.78, 95% CI: 0.65, 0.93) related to the late-onset. IADL disability-free life expectancies at 65 years old in the late-onset group were 15.6 years for women and 14.4 for men, respectively, comprising 56.6% and 64.2% of their remaining life, whereas those of the early-onset group were 4.8 and 4.6 years for women and men respectively, comprising 22.5% and 27.2% of remaining life.Conclusions: Early-onset of IADLs disability may correlate to chronic conditions, and engagement in employment, exercise, and social participation were associated with a reduced risk of early disability in IADLs.

scholarly journals Clinical characteristics of patients under 40 years old with early-onset hyperuricaemia: a retrospective monocentric study in China

BMJ Open ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. e025528
Author(s):  
Yi Zhang ◽  
Yong Yang ◽  
Leixi Xue ◽  
Jian Wen ◽  
Lin Bo ◽  
...  
Keyword(s):  
Fatty Liver ◽  
Early Onset ◽  
Clinical Characteristics ◽  
Liver Enzymes ◽  
Late Onset ◽  
Density Lipoprotein ◽  
Control Group ◽  
And Control ◽  
Onset Group ◽  
Early Onset Group

ObjectiveTo investigate the clinical characteristics of patients with early-onset hyperuricaemia (HUC).MethodsA retrospective study using data from the Second Affiliated Hospital of Soochow University was conducted. 623 patients with HUC were divided into early-onset group and late-onset group. Another 201 healthy subjects ≤40 years old were regarded as control group. The data of physical measurements and biochemistry test were collected. Clinical data of early-onset group were compared with late-onset group and control group by analysis of variance (ANOVA) and χ2test. Principal component analysis (PCA) was applied. Logistic regression was used to identify the clinical factors correlated with patients with early-onset HUC.ResultsThe patients of early-onset group had different body mass index (BMI), serum albumin, alanine transaminase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (AKP), gamma-glutamyltransferase (GGT), creatinine (Cr), triglyceride (TG), total cholesterol (TC), low density lipoprotein (LDL), TG/high density lipoprotein (HDL) ratio, HDL and percentage of males, hypertension (HBP) as well as fatty liver compared with healthy people in the control group. Early-onset group patients had different albumin, ALT, fasting blood glucose, Cr, percentage of males and HBP compared with late-onset group patients. PCA identified four significant patterns including PC1 (labelled ‘TG and HDL’), PC2 (labelled ‘fatty liver and liver enzymes’), PC3 (labelled ‘TC and LDL’) and PC4 (labelled ‘AKP’). The results of univariate and multivariate logistic regression analysis showed that BMI, HBP and albumin were correlative factors for early onset of HUC when the patients with early-onset and late-onset HUC were involved, while gender, BMI, PC1, PC2 and PC4 were correlative factors for early-onset HUC when the early-onset and control groups were involved.ConclusionThis study described a group of patients with early-onset HUC with distinct clinical features. Gender, BMI, ‘TG and HDL’, ‘fatty liver and liver enzymes’ and ‘AKP’ have higher values than HBP, type 2 diabetes mellitus and ‘TC and LDL’ in patients under 40 years old with early-onset HUC.

Spatial Task Performance: A Meta-Analysis

1988 ◽  
Vol 82 (6) ◽  
pp. 231-236 ◽  
Author(s):  
D.J. McLinden
Keyword(s):  
Task Performance ◽  
Early Onset ◽  
Visually Impaired ◽  
Age Of Onset ◽  
Late Onset ◽  
Spatial Task ◽  
Future Research ◽  
Visually Impaired Persons ◽  
Spatial Task Performance ◽  
Onset Group

The literature which compared spatial task performance of blind and sighted subjects was analyzed using a meta-analytic approach. Effect sizes were computed for comparisons between early versus late onset visually impaired subjects, early onset versus sighted, late onset versus sighted, and mixed onset versus sighted. The results are based on 47 studies that analyzed the spatial task performance of 1,289 sighted subjects, 691 early onset subjects, 183 late onset, and 657 mixed onset. The early onset group generally showed poorer performance in comparisons with either the late onset or the sighted groups. Comparisons involving the mixed onset group showed inconsistent results. This finding is discussed in light of the need to more exactly specify the variable of age of onset. The findings from this study synthesize the past research efforts in this field. Suggestions for a future research agenda include a shift toward examining within group differences among visually impaired persons.

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