Depth-Related Visuomotor Performance in Keratoconus and Its Relationship to Stereopsis

Area of Science:

• Ophthalmology
• Neuroscience
• Visual Science

Background:

• Keratoconus, a progressive eye condition, often leads to irregular corneas and visual disturbances.
• Degraded binocularity can significantly affect depth perception and visuomotor control, impacting daily activities.

Purpose of the Study:

• To quantify the impact of keratoconus-related binocular vision impairment on a depth-related visuomotor task.
• To assess the improvement in visuomotor performance with rigid contact lenses in keratoconus patients.
• To determine if stereo vision thresholds can predict visuomotor task performance.

Main Methods:

• A depth-related visuomotor task involving a metal loop and a convoluted wire was used.
• Error rates and speed were measured in controls, keratoconus patients (with and without rigid contact lenses), and myopes.
• Stereo thresholds were assessed using random-dot stimuli.

Main Results:

• Keratoconus patients showed impaired binocular visuomotor performance compared to controls and myopes.
• Rigid contact lenses significantly improved error rates in keratoconus patients.
• Visuomotor task performance was poorly correlated with stereo thresholds across all groups.

Conclusions:

• Impaired binocularity in keratoconus affects depth-related visuomotor tasks.
• Rigid contact lenses offer a partial solution for visual deficits in keratoconus.
• Stereo vision thresholds are not reliable predictors of visuomotor task performance in keratoconus.