Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Mesopic visual acuity is less crowded

Mesopic visual acuity is less crowded Purpose The decrease in visual acuity under low luminance conditions is well known. Recent laboratory evidence showed that crowding under low luminance (mesopic) light levels is less robust than under photopic conditions. The present study examines whether such differences in crowding influence clinical measurements of mesopic visual acuity, including test-retest repeatability. Methods Twenty adult subjects with normal or corrected to normal visual acuity were recruited for the study. Monocular visual 2 2 acuity was measured under photopic (228 cd/m ) and mesopic (0.164 cd/m ) luminance conditions using a letter chart, similar in principle to the ETDRS logMAR chart, presented on a computer monitor. Three rows of five letters, each row differing in size by 0.05 logMAR from largest to smallest were displayed at the center of the monitor. The level of crowding was varied by varying the separation between horizontally adjacent letters from 100% optotype size to 50, 20, and 10% optotype size. Inter-row spacing was proportional to optotype size. Observers read the letters on the middle row only. Measurements continued by reducing the size of the letters, until three or more errors on the middle row were made. Each correctly identified letter contributed 0.01 to the recorded http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Graefe's Archive for Clinical and Experimental Ophthalmology Springer Journals

Mesopic visual acuity is less crowded

Download PDF
8 pages

Loading next page...
 
/lp/springer_journal/mesopic-visual-acuity-is-less-crowded-fuidHsUYIz
Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Medicine & Public Health; Ophthalmology
ISSN
0721-832X
eISSN
1435-702X
DOI
10.1007/s00417-018-4017-6
pmid
29808376
Publisher site
See Article on Publisher Site

Abstract

Purpose The decrease in visual acuity under low luminance conditions is well known. Recent laboratory evidence showed that crowding under low luminance (mesopic) light levels is less robust than under photopic conditions. The present study examines whether such differences in crowding influence clinical measurements of mesopic visual acuity, including test-retest repeatability. Methods Twenty adult subjects with normal or corrected to normal visual acuity were recruited for the study. Monocular visual 2 2 acuity was measured under photopic (228 cd/m ) and mesopic (0.164 cd/m ) luminance conditions using a letter chart, similar in principle to the ETDRS logMAR chart, presented on a computer monitor. Three rows of five letters, each row differing in size by 0.05 logMAR from largest to smallest were displayed at the center of the monitor. The level of crowding was varied by varying the separation between horizontally adjacent letters from 100% optotype size to 50, 20, and 10% optotype size. Inter-row spacing was proportional to optotype size. Observers read the letters on the middle row only. Measurements continued by reducing the size of the letters, until three or more errors on the middle row were made. Each correctly identified letter contributed 0.01 to the recorded

Journal

Graefe's Archive for Clinical and Experimental Ophthalmology – Springer Journals

Published: May 28, 2018

References

  • Standardized measurement of visual acuity
    Ricci, F; Cedrone, C; Cerulli, L
  • The use of accurate visual acuity measurements in clinical anti-cataract formulation trials
    Elliot, DB; Sheridan, M
  • Reproducibility of visual acuity measurements in patients with retinitis pigmentosa
    Grover, S; Fishman, GA; Gilbert, LD; Anderson, RJ
  • Validity and reliability of visual acuity measurements
    Lovie-Kitchin, JE
  • New visual acuity charts for clinical research
    Ferris, FL; Kassoff, A; Bresnick, GH; Bailey, I
  • New design principles for visual acuity letter charts
    Bailey, IL; Lovie, JE
  • New charts for the measurement of visual acuity at far and near distances
    Sloan, L
  • Über die Beziehung zwischen Lichtsinn und Sehschärfe
    Aulhorn, E
  • Effects of luminance, contrast, and blur on visual acuity
    Johnson, CA; Casson, EJ
  • Luminance effects on visual acuity and small letter contrast sensitivity
    Rabin, J
  • The relation between visual acuity and illumination
    Shlaer, S
  • Visual acuity
    Westheimer, G
  • Validity of low-contrast letter acuity as a visual performance outcome measure for multiple sclerosis
    Balcer, LJ; Raynowska, J; Nolan, R; Galetta, SL; Kapoor, R; Benedict, R; Phillips, G; LaRocca, N; Hudson, L; Rudick, R
  • Low luminance visual acuity in patients with central serous chorioretinopathy
    Fujita, K; Shinoda, K; Matsumoto, CS; Imamura, Y; Mizutani, Y; Tanaka, E; Mizota, A; Oda, K; Yuzawa, M
  • Clinical disorders affecting mesopic vision
    Petzold, A; Plant, GT
  • Impaired mesopic visual acuity in eyes with early age-related macular degeneration
    Puell, MC; Barrio, AR; Palomo-Alvarez, C; Gómez-Sanz, FJ; Clement-Corral, A; Pérez-Carrasco, MJ
  • Standard measures of visual acuity do not predict drivers’ recognition performance under day or night conditions
    Wood, JM; Owens, DA
  • Repeatability of mesopic visual acuity measurements using high-and low-contrast ETDRS letter charts
    Barrio, A; Antona, B; Puell, MC
  • Determinants and standardization of mesopic visual acuity
    Lin, RJ; Ng, JS; Nguyen, AL
  • The effect of optical blur on visual acuity for targets of different luminances
    Simpson, TL; Barbeito, R; Bedell, HE
  • Variability of measurements of visual acuity in a large eye clinic
    Siderov, J; Tiu, AL
  • Contour interaction for foveal acuity targets at different luminances
    Bedell, HE; Siderov, J; Waugh, SJ; Zemanová, R; Pluháček, F; Musilová, L
  • Peripheral contour interaction is similar under photopic and scotopic luminances
    Musilova, L; Pluhacek, F; Bedell, HE; Marten-Ellis, S; Siderov, J
  • Modifications de la difficulté de séparation dans l'oeil amblyope strabique àluminance mésopique. Archives d
    Matteucci, P; Maraini, G; Peralta, S
  • Visual acuity scored by the letter-by-letter or probit methods has lower retest variability than the line assignment method
    Bosch, ME; Wall, M
  • Design and analysis: a researcher's handbook
    Keppel, G
  • Statistical methods for assessing agreement between two methods of clinical measurement
    Bland, JM; Altman, DG
  • The repeatability of measurement of the ocular components
    Zadnik, K; Mutti, DO; Adams, AJ
  • Exact parametric confidence intervals for Bland-Altman limits of agreement
    Carkeet, A
  • Foveal contour interaction for low contrast acuity targets
    Siderov, J; Waugh, SJ; Bedell, HE
  • Foveal contour interaction on the edge: response to ‘Letter-to-the-Editor’by Drs. Coates and Levi
    Siderov, J; Waugh, SJ; Bedell, HE
  • The effects of blur and eccentric viewing on adult acuity for pediatric tests: implications for amblyopia detection
    Formankiewicz, MA; Waugh, SJ
  • New concepts on visual acuity
    Flom, MC
  • Crowding and visual acuity measured in adults using paediatric test letters, pictures and symbols
    Lalor, SJ; Formankiewicz, MA; Waugh, SJ
  • Crowding can steepen the psychometric function for visual acuity
    Reich, L; Hoyt, K