Table 1 Components of the fix-and-follow grading system
From: An office-based fix-and-follow grading system assessing visual function in preverbal children
Fixation: The target for fixation was located at a distance of 30 cm, and the test was performed under binocular conditions | |
Level 1 | No response to the target |
Level 2 | A response to the target, but only for < 3 s |
Level 3 | Only one of the two criteria below (1 and 2) were met |
Level 4 | Both of the two criteria below were met |
(1) Fixed on the target for ≥3 s | |
(2) Saccadic eye movement from one target to another | |
Following: Horizontal smooth pursuit eye movement within 30-degree ranges | |
Level 1 | No movement |
Level 2 | Partial movement |
Level 3 | Complete movement |