Recognition Speed Using a Bioptic Telescope

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Abstract

Purpose.

This study sought to quantify the training and the asymptotic efficiency of novice users of spectacle-mounted bioptic telescopes.

Methods.

Fifteen subjects with simulated 20/200 central acuity were fitted with bioptic telescopes. We measured the speed with which subjects were able to use a bioptic telescope to locate and identify a small letter, which was presented peripherally in a crowded array of letters at ±45° eccentricity. Both the target onset and its location were random. Subjects participated in four experimental sessions for a total of 500 (short session group) or 1000 trials (long session group).

Results.

After training, the letter recognition speed with a bioptic telescope decreased by about 800 ms. Most of the improvement, however, occurred within the first ∼150 trials. There were no systematic differences between groups. The asymptotic recognition speed with a bioptic telescope was about 1000 ms, 450 ms longer than the recognition speed in the same task but with 20/20 vision. Preliminary measurements suggest that these learning effects persist over a period of several years.

Conclusions.

Evidently, novice users can quickly acquire proficiency in using a spectacle-mounted bioptic telescope. This task could be used to train new bioptic telescope users in a safe environment and to evaluate their progress.

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