Visibility Vol 16 Issue 4, 2022

Small telescopes have been proven to be useful for people with vision impairment assisting them in identifying distant objects thereby aiding their mobility and independent travel. These telescopes are typically labeled by their magnification power and objective lens size, both of which are easy to measure clinically. A third parameter that is critical to ease of use and function, is the field of view. While manufacturers state the visual field angles of telescopes, they cannot be easily verified in a clinical setting. We utilized a standard tangent screen to verify the extent of the useful visual fields through a variety of commonly used telescopic devices used in low vision rehabilitation.

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