READING NEWSPRINT BUT NOT HEADLINES: PITFALLS IN MEASURING VISUAL ACUITY AND COLOR VISION IN PATIENTS WITH BULLSEYE MACULOPATHY AND OTHER MACULAR SCOTOMAS

2008 ◽  
Vol 2 (1) ◽  
pp. 83-84 ◽  
Author(s):  
Janet S. Sunness
Keyword(s):  
Visual Acuity ◽  
Color Vision

scholarly journals Visual Acuity, Contrast Sensitivity and Color Vision Three Years After Iodine-125 Brachytherapy for Choroidal and Ciliary Body Melanoma

2015 ◽  
Vol 9 (1) ◽  
pp. 131-135 ◽  
Author(s):  
Irena Tsui ◽  
Robert M Beardsley ◽  
Tara A McCannel ◽  
Scott C Oliver ◽  
Melissa W Chun ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Contrast Sensitivity ◽  
Color Vision ◽  
Ciliary Body ◽  
Case Series ◽  
Vision Measurement ◽  
Corrected Visual Acuity ◽  
Iodine 125 ◽  
Decrease In Visual Acuity ◽  
Ciliary Body Melanoma

Purpose : To report visual acuity, contrast sensitivity and color vision prior to, 1 year after, 2 years after and 3 years after iodine-125 brachytherapy for choroidal and ciliary body melanoma (CCM). Design : Prospective interventional case series. Participants : Thirty-seven patients (37 eyes) with CCM. Methods : Patients had best-corrected Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity, Pelli-Robson contrast sensitivity and Hardy-Rand-Rittler color vision measurement; comprehensive ophthalmology examination; optical coherence tomography; and ultrasonography at baseline prior to, 1 year after, 2 years after and 3 years after I-125 brachytherapy. Main Outcome Measures : Visual acuity, contrast sensitivity and color vision prior to, 1 year after, 2 years after and 3 years after brachytherapy. Results : Nineteen (19) men and 18 women with mean age of 58 years (SD 13, range 30-78) prior to, 1 year after, 2 years after and 3 years after brachytherapy had mean best-corrected visual acuity of 77 letters (20/32), 65 letters (20/50), 56 letters (20/80) and 47 letters (20/125); contrast sensitivity of 30, 26, 22 and 19 letters; color vision of 26, 20, 17 and 14 test figures, respectively. Decrease in visual acuity, contrast sensitivity and color vision was statistically significant from baseline at 1 year, 2 years, and 3 years after brachytherapy. Decreased acuity at 3 years was associated with mid-choroid and macula melanoma location, ≥ 4.1 mm melanoma height, radiation maculopathy and radiation optic neuropathy. Conclusion : 1, 2 and 3 years after brachytherapy, eyes with CCM had significantly decreased visual acuity, contrast sensitivity and color vision.

Retinal toxicity after high-dose cisplatin therapy.

1985 ◽  
Vol 3 (12) ◽  
pp. 1683-1689 ◽  
Author(s):  
G Wilding ◽  
R Caruso ◽  
T S Lawrence ◽  
Y Ostchega ◽  
E J Ballintine ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Ovarian Carcinoma ◽  
Causal Relationship ◽  
Color Vision ◽  
Retinal Toxicity ◽  
High Dose ◽  
Visual Dysfunction ◽  
Blurred Vision ◽  
Cone Dysfunction ◽  
Cisplatin Therapy

Because of increasing complaints of visual dysfunction, 13 patients with refractory or recently diagnosed ovarian carcinoma were evaluated for possible cisplatin-induced ophthalmologic toxicity. All patients had received high-dose cisplatin (200 mg/m2 in five divided daily doses) over two to four cycles. Eight patients (62%) developed symptoms of blurred vision and three (23%) also developed altered color perception. Retinal toxicity in the form of cone dysfunction was documented by electroretinography and color vision testing in 11 patients. Three patients were studied prospectively. Two patients who developed cone dysfunction had normal ophthalmologic exams before the initiation of chemotherapy or after one cycle of cisplatin, suggesting a causal relationship between cisplatin therapy and subsequent retinal abnormalities. Though visual acuity improved off therapy, color vision abnormalities persisted as long as 16 months beyond therapy.

scholarly journals A Clinical Study of Optic Disc Edema in a Tertiary Eye Center of Nepal

2019 ◽  
Vol 11 (2) ◽  
pp. 122-129
Author(s):  
Anil Parajuli ◽  
Ananda Kumar Sharma ◽  
Sanjeeta Sitaula
Keyword(s):  
Visual Acuity ◽  
Contrast Sensitivity ◽  
Color Vision ◽  
Optic Disc ◽  
Blind Spot ◽  
Optic Disc Edema ◽  
Disc Edema ◽  
Vision Defect ◽  
Common Causes ◽  
Life Threatening

Purpose: To evaluate the etiology and clinical presentation of cases with optic disc edema presenting to a tertiary eye center of Nepal. Background: The etiology of optic disc edema ranges from relatively benign to potentially sight and life threatening conditions. Till date very few studies have been done on disc edema in Nepal. Method: The authors conducted a prospective, descriptive study at B.P. Koirala Lions Center for Ophthalmic Studies (BPKLCOS), Nepal. All cases with disc edema presenting to the out patient department (OPD) from January 1, 2014 to June 30, 2015 were included in the study. Results: Total 112 patients were included in the study, out of which diagnosis could be established in 99. The mean age of the patients was 32.54 ± 13.97 years with the majority being female. The most common cause of disc edema was idiopathic intracranial hypertension (IIH) (37.5%,). Majority of the patients complained of isolated diminution of vision (38.4%). Among the eyes affected, 78.3% had best corrected visual acuity (BCVA) 6/6-6/18, 36.6% had color vision defect and 31.4% had reduced contrast sensitivity. The most common visual field defect was isolated enlarged blind spot (39.7 %). Conclusion: IIH followed by optic neuritis (ON) are the most common causes of disc edema. Conditions with disc edema mainly affect the age group 21-40 years with females affected 2.5 times more than males. Visual acuity, color vision and contrast sensitivity are deranged in majority of cases of ON and normal in majority of cases of IIH.

scholarly journals Clinical characteristics of progressive nonarteritic anterior ischemic optic neuropathy

2021 ◽  
Vol 14 (4) ◽  
pp. 517-522
Author(s):  
Omer Y. Bialer ◽  
Keyword(s):  
Risk Factors ◽  
Visual Acuity ◽  
Color Vision ◽  
Symptom Onset ◽  
Systemic Risk ◽  
Clinical Characteristics ◽  
Visual Outcome ◽  
Ischemic Optic Neuropathy ◽  
Systemic Risk Factors

AIM: To study whether patients with progressive nonarteritic anterior ischemic optic neuropathy (NAION) present earlier than patients with stable NAION and to describe their clinical characteristics and visual outcome. METHODS: This was a retrospective chart review. All patients with NAION seen during the acute stage from January 2012 to December 2018 were reviewed. Patients were included if they had documented disc edema and follow up of at least 3mo. Patients with progressive NAION were identified if they worsened in 2 out of 3 parameters: visual acuity ≥3 Snellen lines; Color vision ≥4 Ishihara plates; the visual field defect involved a new quadrant. The clinical characteristics, time from symptom onset to presentation, systemic risk factors and visual outcome were compared to patients with stable NAION. RESULTS: Totally 122 NAION cases met the inclusion criteria. Mean age was 58.1y (range 22-74), 70% were men. Twenty cases (16.4%) had progressive NAION. Patients with progressive NAION did not differ from stable NAION in their demographics, systemic risk factors or in their initial visual deficit. At last follow up, median visual acuity was 1.0 logMAR (IQR 0.64-1.55) in patients with progressive NAION, vs 0.18 (IQR 0.1-0.63) in stable NAION (P<0.001). Median color vision testing was 0 plates correct (IQR 0-2.5%) vs 92% plates correct (IQR 50%-100%) in the stable NAION group (P<0.001). Patients with progressive NAION differed in the time from symptom onset to presentation (median 2d vs 5d, P=0.011). CONCLUSION: We find no identifiable risk factors associated with progressive NAION. Progressors arrive earlier for ophthalmological evaluation.

Clinical and Etiological Profile of Patients with Optic Disc Edema in Tertiary Care Centre of Nepal

2019 ◽  
Vol 41 (1) ◽  
pp. 24-30
Author(s):  
Ritish K Shah
Keyword(s):  
Visual Acuity ◽  
Visual Field ◽  
Optic Neuritis ◽  
Color Vision ◽  
Optic Disc ◽  
Optic Neuropathy ◽  
Tertiary Care ◽  
Ischemic Optic Neuropathy ◽  
Optic Disc Edema ◽  
Disc Edema

Introduction: Optic disc edema can be a manifestation of various neurological disorders. Identification of those causes is possible in most cases using tests like visual acuity, color vision, visual field and suitable radiological imaging. Study in Nepalese population with regard to optic disc edema is scarce. Hence this study aims to act as a guideline for evaluation of such cases and help in further studies in this regard. Methods: A descriptive, cross-sectional study was conducted in all cases of optic disc edema presenting to neuro-ophthalmology clinic of B.P. Koirala Lions Centre for Ophthalmic Studies from January 2011 to June 2012. A detailed history was obtained and proper ocular and nervous examination was done by ophthalmologist and neuro-physician. Assessment of visual acuity, color vision, contrast sensitivity and visual field along with radiological tests were done in all possible cases. Results: Out of all the cases evaluated, 38 cases where causes of optic disc edema could be established were included in the study. The commonly affected age group was 31 to 40 years (26.3%) and most of them were males. The commonest cause observed was optic neuritis (36.8%). Others were papilledema, idiopathic intracranial hypertension, toxic optic neuropathy, non-arteritic anterior ischemic optic neuropathy (NA-AION), compressive and traumatic optic neuropathy. Conclusion: Optic neuritis and papilledema should be considered as common differential diagnosis in patients with optic disc edema. NA-AION is a relatively uncommon disease among Nepalese population.

Effects of blunt trauma of eye on retinal nerve fibre layer

2021 ◽  
Vol 2 (4) ◽  
pp. 228-232
Author(s):  
Kumar Aalok ◽  
Keyword(s):  
Visual Acuity ◽  
Contrast Sensitivity ◽  
Blunt Trauma ◽  
Color Vision ◽  
Control Groups ◽  
Rnfl Thickness ◽  
Department Of Ophthalmology ◽  
Significant Difference ◽  
And Control

AIM: To study the effects of blunt trauma of eye on visual acuity and retinal nerve fiber layer (RNFL). METHODS: A prospective observational study was done on the patients of a road traffic accident (RTA) having blunt trauma injury of the eye from august 2018 to July 2019 at the Department of Ophthalmology, Hind Institute of Medical Sciences, Barabanki. Patients between the age group of 20 to 65 years undergoing RTA with ocular complaints were included in this study. Colour vision, contrast sensitivity, and best-corrected visual acuity (BCVA) were recorded, RNFL analysis was done through OCT. RESULTS: A total of 108 patients were enrolled in this study and were grouped as 54 cases and 54 controls. The mean age was 43±2.3 years with 11 (20.37%) females and 43 (79.6%) males in the case group. At initial visit after RTA, the difference between color vision, contrast sensitivity and BCVA between right and left eyes of cases and controls were significant. After a follow up of 3mo only significant difference was noted in contrast sensitivity between cases and control groups. Change in color vision and BCVA after 3mo was insignificant. Similarly, an initial significant difference was noted in mean RNFL thickness between cases and control groups, but after follow up of 3mo mean RNFL thickness difference was significant only in superior and temporal quadrants. CONCLUSION: RTA or blunt trauma of eye can lead to persistent RNFL thinning and decreased visual function.

CLINICAL PROFILE, RISK FACTORS AND VISUAL OUTCOME IN PATIENTS OF ACUTE CENTRAL SEROUS CHORIORETINOPATHY IN A TERTIARY HEALTH CARE CENTRE IN NORTHERN INDIA.

2021 ◽  
pp. 67-69
Author(s):  
Upasna Ajmani ◽  
Prempal Kaur ◽  
Dinesh Kumar
Keyword(s):  
Risk Factors ◽  
Visual Acuity ◽  
Color Vision ◽  
Central Serous Chorioretinopathy ◽  
Visual Outcome ◽  
Health Care Centre ◽  
Northern India ◽  
Potential Risk Factors ◽  
The Mean ◽  
Vision Defects

Central Serous Chorioretinopathy(CSCR) is predominantly idiopathic and self limiting macular disease . Present study was planned to determine clinical prole and the factors contributing in nal visual outcome in CSCR.. Retrospective observational study was done on 65 eyes of 53 patients over a period of 2 years. Their best corrected visual acuity(BCVA), color vision, metamorphopsia and mean central macular thickness(CMT) at presentation were compared with values at 6 months follow-up. Mean age of patients was 38 years ± 5.43 years. 79.24% patients were males and 77.36% had unilateral involvement. 30.19% patients gave history suggestive of one or more potential risk factors. The mean BCVA improved from 20/80 at presentation to 20/20 and 20/25 in patients with isolated and CSCR with PED respectively at 6 months. The mean CMT reduced signicantly in both isolated CSCR and when associated with PED at 6 months. Color vision defects in 46(70.77%) eyes and metamorphopsia in 49(75.38%) eyes at presentation persisted in 7(10.7%) eyes and 20(30.76%)eyes respectively at 6 months. Final visual outcome signicantly correlated with visual acuity at presentation. CONCLUSION: BCVA at presentation strongly predicts nal visual prognosis. Patients need to be counselled regarding persistence of color vision decits and metamorphopsia.

Color vision is strongly associated with retinal thinning in multiple sclerosis

2012 ◽  
Vol 18 (7) ◽  
pp. 991-999 ◽  
Author(s):  
Pablo Villoslada ◽  
Ami Cuneo ◽  
Jeffrey Gelfand ◽  
Stephen L Hauser ◽  
Ari Green
Keyword(s):  
Multiple Sclerosis ◽  
Visual Acuity ◽  
Color Vision ◽  
Color Discrimination ◽  
Visual Pathway ◽  
Visual Disability ◽  
Fiber Layer ◽  
Cross Sectional ◽  
Low Contrast ◽  
Sd Oct

Objectives: Multiple Sclerosis (MS) frequently causes injury to the anterior visual pathway (AVP), impairing quality of life due to visual dysfunction. Development of biomarkers in MS is a high priority and both low-contrast visual acuity (LCVA) and time-domain optical coherence tomography (TD-OCT) have been proposed as candidates for this purpose. We sought to assess whether psychophysical assessments of color vision are similarly correlated with structural measures of AVP injury, and therefore augment measures of visual disability in MS. Methods: We studied the association between high-contrast visual acuity (HCVA), LCVA, color vision (Hardy–Rand–Rittler plates (HRR) and Lanthony D15 tests) and OCT, using both high-resolution spectral-domain OCT (SD-OCT; Spectralis, Heidelberg Engineering, Germany) and TD-OCT (Stratus, Carl Zeiss, US) in a cohort of 213 MS patients (52 with previous optic neuritis) and 47 matched controls in a cross-sectional study. Results: We found that MS patients have impairments in HCVA and LCVA ( p < 0.001) but that they suffer from even more profound abnormalities in color discrimination ( p < 0.0001). We found strong correlation between color vision and SD-OCT measures of retinal nerve fiber layer (RNFL) thickness (average RNFL, r = 0.594, p < 0.001) and papillomacular bundle thickness ( r = −0.565, p < 0.001). The correlation between OCT scores and functional visual impairments of all types was much stronger for SD-OCT than for TD-OCT. Conclusion: Our results indicate that color vision is highly correlated with these OCT scores when compared with traditional measures of visual acuity. Also we found that SD-OCT is superior to TD-OCT for detecting anterior visual pathway damage in MS. This makes both color-visual measures and SD-OCT strong candidate biomarkers of disease progression.

scholarly journals THE RELATION BETWEEN VISUAL ACUITY AND ILLUMINATION

1928 ◽  
Vol 11 (3) ◽  
pp. 255-281 ◽  
Author(s):  
Selig Hecht
Keyword(s):  
Visual Acuity ◽  
Color Vision ◽  
Unit Area ◽  
Resolving Power ◽  
Intensity Increase ◽  
Blind Person ◽  
Rods And Cones ◽  
Threshold Distribution ◽  
Peripheral Area ◽  
Definite Manner

1. Visual acuity varies in a definite manner with the illumination. At low intensities visual acuity increases slowly in proportion to log I; at higher intensities it increases nearly ten times more rapidly in relation to log I; at the highest illuminations it remains constant regardless of the changes in log I. 2. These variations in visual acuity measure the variations in the resolving power of the retina. The retina is a surface composed of discrete rods and cones. Therefore its resolving power depends on the number of elements present in a unit area. The changes in visual acuity then presuppose that the number of elements in the retina is variable. This cannot be true anatomically; therefore it must be assumed functionally. 3. To explain on such a basis the variations of visual acuity, it is postulated that the thresholds of the cones and of the rods are distributed in relation to the illumination in a statistical manner similar to that of other populations. In addition the rods as a whole have thresholds lower than the cones. Then at low intensities the increase in visual acuity depends on the augmentation of the functional rod population which accompanies intensity increase; and at higher intensities the increase in visual acuity depends on the augmentation of the functional cone population. The number of cones per unit foveal area is much greater than the number of rods per unit peripheral area, which accounts for the relative rates of increase of rod and cone visual acuity with intensity. At the highest illuminations all the cones are functional and no increase in visual acuity is possible. 4. If this division into rod visual acuity and cone visual acuity is correct, a completely color-blind person should have only rod visual acuity. It is shown by a study of the data of two such individuals that this is true. 5. The rod and cone threshold distribution has been presented as a purely statistical assumption. It can be shown, however, that it is really a necessary consequence of a photochemical system which has already been used to describe other properties of vision. This system consists of a photosensitive material in reversible relation with its precursors which are its products of decomposition as well. 6. On the basis of these and other data it is shown that a minimal retinal area in the fovea, which can mediate all the steps in such functions as visual acuity, intensity discrimination, and color vision, contains about 540 cones. Certain suggestions with regard to a quantitative mechanism for color vision are then correlated with these findings, and are shown to be in harmony with accurately known phenomena in related fields of physiology.

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