scholarly journals Comparing a Home Vision Self-Assessment Test to Office-Based Snellen Visual Acuity

2021 ◽  
Vol Volume 15 ◽  
pp. 3205-3211
Author(s):  
Tiffany A Chen ◽  
Jonathan Li ◽  
Julie M Schallhorn ◽  
Catherine Q Sun
Keyword(s):  
Visual Acuity ◽  
Self Assessment ◽  
Snellen Visual Acuity

scholarly journals Correction to: Digital Tools for the Self-Assessment of Visual Acuity: A Systematic Review

2021 ◽  
Author(s):  
Janneau L. J. Claessens ◽  
Judith R. Geuvers ◽  
Saskia M. Imhof ◽  
Robert P. L. Wisse
Keyword(s):  
Systematic Review ◽  
Visual Acuity ◽  
The Self ◽  
Digital Tools ◽  
Self Assessment

scholarly journals Using an excel spreadsheet to convert Snellen visual acuity to LogMAR visual acuity

Eye ◽  
2020 ◽  
Vol 34 (11) ◽  
pp. 2148-2149
Author(s):  
Stephenie Tiew ◽  
Christina Lim ◽  
Tharsica Sivagnanasithiyar
Keyword(s):  
Visual Acuity ◽  
Excel Spreadsheet ◽  
Snellen Visual Acuity

Time to achieve best postoperative visual acuity following Boston keratoprosthesis surgery

2021 ◽  
pp. bjophthalmol-2020-317483
Author(s):  
Jonathan El-Khoury ◽  
Majd Mustafa ◽  
Roy Daoud ◽  
Mona Harissi-Dagher
Keyword(s):  
Visual Acuity ◽  
Contributing Factors ◽  
Time Duration ◽  
Patient Demographics ◽  
Snellen Visual Acuity ◽  
Boston Type 1 Keratoprosthesis ◽  
The Mean ◽  
Retroprosthetic Membrane

Background/aimsTo evaluate the time needed for patients with Boston type 1 keratoprosthesis (KPro) to reach their best-corrected visual acuity (BCVA) and all contributing factors.MethodsWe retrospectively reviewed 137 consecutive eyes from 118 patients, measured how long they needed to reach their BCVA and looked at factors that might affect this time duration including patient demographics, ocular comorbidities and postoperative complications.ResultsThe mean follow-up was 5.49 years. The median time to BCVA postoperatively was 6 months, with 47% of patients achieving their BCVA by 3 months. The mean best achieved logMAR visual acuity was 0.71, representing a gain of 6 lines on the Snellen visual acuity chart. Postoperative glaucoma, retroprosthetic membrane (RPM) and endophthalmitis prolonged this duration. We found no correlation between the following factors and time to BCVA: gender, age, indication for KPro surgery, primary versus secondary KPro, number of previous penetrating keratoplasties, previous retinal surgery, intraoperative anterior vitrectomy and preoperative glaucoma.ConclusionIn our retrospective cohort, the majority of subjects reached their BCVA between 3 and 6 months after KPro implantation. This duration was significantly prolonged by the development of postoperative glaucoma, RPM and endophthalmitis.

scholarly journals Estimating visual acuity by character counting using the Snellen visual acuity chart

Eye ◽  
2004 ◽  
Vol 19 (6) ◽  
pp. 622-624 ◽  
Author(s):  
A H Levy ◽  
T J McCulley ◽  
B L Lam ◽  
W J Feuer
Keyword(s):  
Visual Acuity ◽  
Snellen Visual Acuity

scholarly journals Inverted Internal Limiting Membrane Flap Technique for Extra Large Macular Holes

2018 ◽  
Vol 1 (1) ◽  
pp. 07-13
Author(s):  
Ogugua Ndubuisi Okonkwo ◽  
Adekunle Olubola Hassan ◽  
Olufemi Oderinlo
Keyword(s):  
Visual Acuity ◽  
Case Series ◽  
Functional Results ◽  
Internal Limiting Membrane ◽  
Vital Role ◽  
Symptom Duration ◽  
Flap Technique ◽  
Macular Holes ◽  
Snellen Visual Acuity ◽  
Sd Oct

Aim: To investigate the outcome of the inverted Internal Limiting Membrane (ILM) flap technique for extra large idiopathic macular holes (MHs).Methods: A retrospective non-comparative surgical case series of seven eyes of 7 patients with MHs (base diameter of at least 1000 ?m) was conducted. All the MHs were treated using pars plana vitrectomy and brilliant blue G (BBG)-assisted inverted ILM flap technique. Spectral Domain- Optical Coherence Tomography (SD-OCT) images were used to assess the anatomical outcomes of surgery including the macular microstructure, while Best Corrected Snellen Visual Acuity (BCSVA) was used to evaluate the functional outcomes.Results: The average MH size was 1241microns and average symptom duration was nineteen months. All eyes achieved successful anatomical closure and there was no occurrence of a flat open type closure. SD-OCT microstructural study revealed a reconstruction of the Ellispod Zone (EZ) and External Limiting Membrane (ELM), in only 3 eyes. There was an improvement in visual acuity in 5 eyes, while 2 eyes maintained the same as pre operative vision. The largest increase in post operative visual acuity gain was a 4-line improvement in Best Corrected Snellen Visual Acuity (BCSVA) noted in one of the 3 eyes with reconstructed EZ and ELM. The 3 months symptom duration in this patient was the shortest in this series.Conclusion: Inverted ILM flap technique is a safe and effective approach for the management of extra large chronic idiopathic MHs with demonstrably good anatomical and limited functional results in a majority of cases. Postoperative reconstruction of the microstructure is however seen only in a minority of eyes. Despite an absence of the outer retina (EZ and ELM), some eyes still experience an improvement in vision. The symptom duration may play a vital role in functional outcome in this subset of extra large chronic MHs.

The relationship between indoor and outdoor Snellen visual acuity in cataract patients

1988 ◽  
Vol 14 (1) ◽  
pp. 35-39 ◽  
Author(s):  
Albert C. Neumann ◽  
George R. McCarty ◽  
Thomas O. Steedle ◽  
Donald R. Sanders ◽  
Marsha G. Raanan
Keyword(s):  
Visual Acuity ◽  
Snellen Visual Acuity ◽  
The Relationship ◽  
Cataract Patients ◽  
Indoor And Outdoor

Contrast Sensitivity and Visual-Field Thresholds in Patients with Thyroid Optic Neuropathy

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 194-194
Author(s):  
J Jankauskiene ◽  
R Lukauskiene ◽  
B Mickiene
Keyword(s):  
Visual Acuity ◽  
Visual Field ◽  
Contrast Sensitivity ◽  
Optic Neuropathy ◽  
Control Group ◽  
Ophthalmological Examination ◽  
Threshold Test ◽  
Spatial Frequencies ◽  
Snellen Visual Acuity ◽  
The Mean

Thyroid optic neuropathy is one of the most troubling complications of endocrine ophthalmopathies. It is related to the degree of extraocular muscle swelling in the apex of the orbit. The purpose of this study was to investigate contrast sensitivity and visual-field thresholds in patients with thyroid optic neuropathy. We examined twenty-two patients aged 29 – 63 years (mean 45.3 years). The control group consisted of fifteen healthy persons of similar age. Contrast sensitivity was measured by means of Volkov's charts (sinusoidal gratings) at eight spatial frequencies from 17.5 to 0.46 cycles deg−1. The visual field was investigated with a static automatic perimeter (Allgan Humphrey Field Analyzer) by means of the central 30-2 threshold test. All patients underwent a complete ophthalmological examination including best corrected Snellen visual acuity, fundus copy, and proptosis measurement with the Hertel exophthalmometer. The mean proptosis of patients was 19.4 mm. Fifteen of the patients had decreased visual acuity. Contrast sensitivity at low spatial frequencies was significantly reduced in the patients. It was established that a reduction of visual-field threshold accompanies the decrease of visual acuity. Our results show that contrast sensitivity and visual-field threshold testing are very sensitive at detecting early optic neuropathy and may be a useful means of following patients after treatment.

scholarly journals Self-retained cryopreserved amniotic membrane for treating severe corneal ulcers: a comparative, retrospective control study

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Han Y. Yin ◽  
Anny M. S. Cheng ◽  
Sean Tighe ◽  
Philip Kurochkin ◽  
Jamie Nord ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Adjuvant Therapy ◽  
Corneal Ulcer ◽  
Control Group ◽  
Retrospective Case ◽  
Corneal Ulcers ◽  
Initial Visual Acuity ◽  
Snellen Visual Acuity ◽  
Clinically Significant ◽  
Control Study

Abstract To compare the effectiveness of self- retained cryopreserved AM as an adjuvant therapy for infectious corneal ulcers. Retrospective, case–control study of 24 eyes of 24 consecutive patients with central and paracentral corneal infectious ulcers and initial visual acuity worse than 20/200. Among them, 11 eyes of 11 patients received additional placement of self-retained cryopreserved AM. Epithelialization and Best Corrected Snellen Visual Acuity (BCSVA) were compared between the two groups. At baseline, both groups had comparable age, gender, visual acuity (VA), size and location of corneal ulcer. Patients receiving additional placement of cryopreserved AM had significantly faster epithelialization within 3.56 ± 1.78 weeks vs 5.87 ± 2.20 weeks (p = 0.01) and achieved complete epithelialization in significantly more patients (72.7% vs 23.1% p = 0.04) despite overall larger baseline defect size (32.7 ± 19.5 mm2 vs 21.5 ± 10.7 mm2, p = 0.11). Consequently, the AM group had clinically significant BCSVA (> 3 lines) (81.8% vs 38.4%, p = 0.047) and total VA improvement (log MAR 0.7 ± 0.6 vs 1.6 ± 0.9, p = 0.016) compared to the control group at the time of complete epithelialization. In-office sutureless AM may be an effective adjuvant therapy in treating sight-threatening infectious corneal ulcers by promoting faster corneal epithelialization and overall better recovery of the VA.

Inadequacy of self-assessment of vision, and fitness to drive

2017 ◽  
Vol 85 (4) ◽  
pp. 207-209
Author(s):  
John Garfield
Keyword(s):  
Visual Acuity ◽  
Visual Field ◽  
Visual Field Defect ◽  
Daily Activities ◽  
Elderly Persons ◽  
Fitness To Drive ◽  
Self Assessment ◽  
Driving Licence ◽  
Field Defect

The author, a retired neurosurgeon then aged 81, describes his own right upper quadrantic homonymous visual field defect which did not impair any normal daily activities. His own occupation allowed him to recognise the defect. It is unlikely that such a defect would have been noticed by other elderly persons. The field defect shown by perimetry (illustrated) debarred him from driving. Self-assessment of visual acuity, and especially fields, is inadequate when applying for renewal of a driving licence. Effective steps to prevent such licensing and the damage that may follow are discussed.

Comparison of the Visual Function Index to the Snellen Visual Acuity Test in Predicting Older Adult Self-Restricted Driving

2010 ◽  
Vol 11 (5) ◽  
pp. 503-507 ◽  
Author(s):  
Shahram Lotfipour ◽  
Bhakti Harishchandra Patel ◽  
Thomas Aaron Grotsky ◽  
Craig L. Anderson ◽  
Erin M. Carr ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Older Adult ◽  
Visual Function ◽  
Function Index ◽  
Snellen Visual Acuity ◽  
Visual Acuity Test ◽  
Acuity Test
Sign in / Sign up

Export Citation Format

Share Document