Central Visual Impairment Clinical Trial
Official title:
Factors Limiting Peripheral Reading
The purpose of this study is to evaluate reading performance in the visual periphery by simulating central vision loss using a computer-controlled gaze-contingent display with an eye tracker. Participants will read a page of text at a comfortable rate. Several manipulations hypothesized to improve reading will be tested, such as an inverted-text "spotlight" of a single word that follows the participant's gaze.
Participants will view paragraphs of multiple sentences of text with their central vision
blocked computationally with a "simulated scotoma." Participants will be free to move their
eyes around the page of text at a comfortable rate. The three outcomes described elsewhere
will be evaluated.
In different blocks, text will contain one or more of several dynamic assistive manipulations
that are hypothesized to enhance reading: 1) inverting the text at a given position, with
instructions for the participant to attend to that location, which simulates a "surrogate
fovea" of a patient with central vision loss. 2) horizontally expanding text to alleviate
within-word crowding. 3) highlighting the next word with a visible indicator to encourage
proper eye movements.
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