The Effects of Deprivation Amblyopia on Fixation Stability and Optokinetic Nystagmus
Bibliographic record
Abstract
Vision and oculomotor control play an essential role in visual perception and motor coordination. Individuals born with unilateral cataracts ultimately develop deprivation amblyopia, which is associated with sensory deficits. By measuring two fundamental eye movements, fixation stability and optokinetic nystagmus, this study aims to understand how congenital cataracts impact oculomotor control. \nFixation stability and OKN were evaluated using the Eyelink eye tracker during binocular and monocular viewing. An infrared filter was used in the monocular condition to block the visible light (i.e., open loop condition) but allowed recording of eye position. The fixation stability experiment utilized a 3° fixation crosshair, while the OKN test involved a black-and-white vertical square-wave grating moving at 10 deg/s. Eye dispersion during fixation was quantified using bivariate contour ellipse area (BCEA), as well as microsaccades rate, amplitude, and slow drifts. OKN response analysis involved calculating the slow-phase gain based on the velocity of the stimulus, and subsequently determining if the response in the fellow eye was symmetrical across nasalward and temporalward stimulus directions. \nThe findings of 18 control participants showed that fixation stability was best during binocular viewing, as indicated by the lowest BCEA value. Fixation stability was poorer during monocular viewing, where the covered eye (open loop condition) exhibited the largest dispersion. Further data analysis revealed that the poorer fixation during monocular closed-loop viewing was explained by increased microsaccade rate and higher slow drift velocity, while the poorer fixation during the open-loop condition was explained by the increase in microsaccade amplitude. The patient group included 7 participants. The fellow eye had fixation that was similar to the control group across binocular and closed-loop monocular viewing, while it was poorer during monocular viewing for the open-loop condition. Amblyopic eye viewing was poorer compared to all viewing conditions in the control group. The OKN response was asymmetrical for 2 of the patients, with one patient showing no response in the temporalward direction, while all 18 control participants exhibited a symmetrical response that was similar for the nasalward and temporalward trials. \nThis study has provided insight into oculomotor control in unilateral deprivation amblyopia. Further research that investigates the underlying neural mechanisms disrupted in oculomotor control in unilateral deprivation amblyopia can help to uncover more effective treatment options to improve the quality of life and sensorimotor deficits in individuals with deprivation amblyopia.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".