Table 1 Modifications of the custom-developed functional visual acuity software
Procedure | Response | Features for next optotype | ||
|---|---|---|---|---|
Direction | Optotype size | Display time | ||
Reaction time measurement | Correct/incorrect | Random direction of four: up, down, left, right | Maintain constant, 0.2 logMAR unit larger than best-corrected visual acuity | Sustained display until response |
Functional visual acuity measurement | Correct; within mRT + 2SD | Decreased by 0.1 logMAR unit | mRT + 2SD | |
Correct; response time was longer than mRT + 2SD | Remained unchanged | mRT + 3SD | ||
Incorrect; within the set display time | Increased by 0.1 logMAR unit | mRT + 3SD | ||
No response; within the set display time | Increased by 0.1 logMAR unit | mRT + 3SD | ||