Peripheral Reading
- Conditions
- Central Visual Impairment
- Interventions
- Behavioral: Gaze-contingent text enhancement
- Registration Number
- NCT03640130
- Lead Sponsor
- University of Houston
- Brief Summary
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.
- Detailed Description
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.
Recruitment & Eligibility
- Status
- UNKNOWN
- Sex
- All
- Target Recruitment
- 6
- Normal vision
- English language
- Less than 20/20 vision in either eye
- Abnormalities which affect vision (amblyopia, keratoconus, etc.)
- Ortho-K lenses
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Single Arm Gaze-contingent text enhancement Each participant will participate in several blocks (randomized order), to evaluate performance with and without behavioral gaze-contingent text enhancements.
- Primary Outcome Measures
Name Time Method Reading accuracy From enrollment to completion of testing (<2 weeks) Ability to correctly answer comprehension questions or orally read words
Efficiency of eye movement From enrollment to completion of testing (<2 weeks) Ability to move the eyes systematically from word to word
Reading speed From enrollment to completion of testing (<2 weeks) Average time/word it takes to read a paragraph of text.
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (1)
University of Houston, College of Optometry
🇺🇸Houston, Texas, United States