Document Detail

Repeatability of mesopic visual acuity measurements using high- and low-contrast ETDRS letter charts.
MedLine Citation:
PMID:  25488572     Owner:  NLM     Status:  Publisher    
PURPOSE: To determine the repeatability of mesopic high-contrast (HC) and low-contrast (LC) visual acuity (VA) measurements made at distance and near in healthy young individuals. While the repeatability of photopic VA is well-known, there is a lack of information with regard to the repeatability of VA measured under low luminance conditions.
METHODS: In two different sessions 1 week apart, best-corrected monocular VA was determined using HC (96 %) and LC (10 %) ETDRS charts under mesopic luminance conditions (0.75 cd/m(2)) at distance (HCD, LCD) and near (HCN, LCN) in 47 healthy subjects aged 22.9 ± 6.8 years. Repeatability was estimated by the Bland and Altman method, whereby the mean difference (MD) and the 95 % limits of agreement were determined as the coefficient of repeatability (COR).
RESULTS: Mean logMAR VA values were HCD = 0.09, LCD = 0.44, HCN = 0.21, and LCN = 0.57. Mean differences in measurements between sessions 1 and 2 were not significant, and low in clinical terms (≤1 letter). Repeatability was better for the distance measurements at both high and lowcontrast (COR HCD ±0.11 and COR LCD ±0.11 logMAR vs COR HCN ±0.15 and COR LCN ±0.16 logMAR), and MDs were also slightly closer to zero for the distance measurements. Similar repeatability was observed between HC and LC VA, both at distance and near.
CONCLUSIONS: In mesopic conditions, ETDRS charts offer repeatable best-corrected monocular VA measurements. The criterion for a significant change in logMAR VA was 1 line at distance and 1.5 lines at near.
Ana Barrio; Beatriz Antona; María C Puell
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-12-9
Journal Detail:
Title:  Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie     Volume:  -     ISSN:  1435-702X     ISO Abbreviation:  Graefes Arch. Clin. Exp. Ophthalmol.     Publication Date:  2014 Dec 
Date Detail:
Created Date:  2014-12-9     Completed Date:  -     Revised Date:  2014-12-10    
Medline Journal Info:
Nlm Unique ID:  8205248     Medline TA:  Graefes Arch Clin Exp Ophthalmol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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