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Volume 36 #1

Contents

  1. An overview of the visual acuity assessment. 2. Theoretical and clinical requirements to the optotypes and chart designs
  2. Assessment of peripheral visual acuity in various conditions of testing
  3. The expression and function of components of signaling cascades of taste, olfactory, and phototransduction in mammalian pancreas beta-cells
  4. Recognition of projectively transformed planar figures. XVI The octet of projectively stable vertices of the oval and new methods for its reference description using the octet
  5. Heteroscedasticity correction to improve tomographic reconstruction with an algebraic approach

Assessment of peripheral visual acuity in various conditions of testing

© 2022 A. V. Belokopytov, G. I. Rozhkova, M. A. Gracheva

Institute for Information Transmission Problems (Kharkevich Institute) Russian Academy of Sciences, 127051 Bolshoy Karetny per. 19, build.1, Moscow, Russia

Received 02 Sep 2021

In studies of peripheral visual acuity (VA), the main difficulties are caused by the necessity to divide attention between the foveal fixation stimulus and the peripheral test target. One of the approaches to exclude the task of central fixation is to create an artificial central scotoma by means of contact lens with implanted occluder. Applying this approach, we have measured the peripheral VA in 3 participants in the range of eccentricities up to 60° by means of two different optotypes – tumbling-E and modified 3-bar target on a specially constructed computerized perimetric setup. It appeared that occlusion of the fixation stimulus per se did not lead to the anticipated increase in the VA, probably because the effect of the instruction “to keep gaze direction straight ahead” is similar to that of the instruction to fixate a visible foveal stimulus. More than that: contact lens with occluder (4-5 mm in diameter) could exert negative effect, supposedly due to veiling the peripheral test target in the cases of uncontrolled involuntary decrease of the pupil diameter leading to significant increase of the blind zone. In all participants, the peripheral VA values appeared to be somewhat better for the modified 3-bar optotypes measuring “resolution acuity” than for the tumbling-E measuring “recognition acuity”. The reliability of the data obtained for the peripheral VA was similar to that of the foveal data. Interindividual variability of data was larger at lower eccentricities.

Key words: peripheral vision, optotypes, visual acuity, resolution acuity, recognition acuity, contact lens with occluder, inter- individual differences

DOI: 10.31857/S0235009222010024

Cite: Belokopytov A. V., Rozhkova G. I., Gracheva M. A. Otsenka perifericheskoi ostroty zreniya v razlichnykh usloviyakh testirovaniya [Assessment of peripheral visual acuity in various conditions of testing]. Sensornye sistemy [Sensory systems]. 2022. V. 36(1). P. 30–43 (in Russian). doi: 10.31857/S0235009222010024

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