Saccadic eye movements in amblyopia: a systematic review and meta-analysis

Area of Science:

• Ophthalmology and Vision Science
• Neuroscience

Background:

• Amblyopia, or 'lazy eye,' is a developmental disorder affecting visual acuity.
• Saccadic latency, the time taken for rapid eye movements, is a key indicator of visual processing speed.

Purpose of the Study:

• To systematically review and meta-analyze the impact of different amblyopia etiologies on saccadic latency.
• To determine if saccadic latency can differentiate between amblyopia types and severities.

Main Methods:

• Systematic review and meta-analysis of nine studies.
• Inclusion of data from 232 individuals with amblyopia and 140 controls.
• Analysis of saccadic latency under amblyopic eye, fellow eye, and binocular viewing conditions.

Main Results:

• Significantly longer saccadic latencies were observed in amblyopes compared to controls.
• The largest effect size was found for mixed amblyopia in the amblyopic eye (g=1.79).
• Saccadic latency increased with higher hyperopic refractive error and with age, particularly for fellow eye and binocular viewing.

Conclusions:

• Saccadic latency is most delayed in the amblyopic eye, especially in mixed amblyopia.
• Measures of saccadic latency are valuable for distinguishing between amblyopia types and severities.
• These findings support the use of saccadic latency in amblyopia diagnosis and treatment planning.