The pattern of changes produced in the saccadic system and vestibuloocular reflex by visually patching one eye

Area of Science:

• Neuroscience
• Ophthalmology
• Vision Science

Background:

• Saccades and vestibulo-ocular reflex (VOR) are typically conjugate, moving both eyes in unison.
• The role of visual input in maintaining this conjugacy is not fully understood.

Purpose of the Study:

• To investigate if saccades and VOR remain equal between eyes without visual input to one eye.
• To determine the impact of monocular patching on saccadic properties and VOR gain.

Main Methods:

• One eye was patched for one week.
• Saccadic properties and VOR gain were measured in both eyes before and after patching.

Main Results:

• The patched eye exhibited altered saccadic step magnitude, postsaccadic drift, and vertical components.
• VOR gain and vertical components during horizontal rotation also changed in the patched eye.
• These changes normalized within one day after patch removal.

Conclusions:

• Visual input is crucial for calibrating saccades and VOR, ensuring conjugate eye movements.
• The brain can selectively alter motor commands to one eye's muscles without affecting the other.
• Shared neural elements likely underlie saccade and VOR adaptations to visual deprivation.