Using OCT Fixation Shift to Assess Eccentric Fixation in Children With Residual Amblyopia.

Area of Science:

• Ophthalmology
• Vision Science
• Pediatric Eye Care

Background:

• Eccentric fixation in amblyopia is typically assessed imprecisely.
• Optical coherence tomography (OCT) fixation shift shows potential for precise quantification.
• Further understanding of OCT fixation shift characteristics in children is needed.

Purpose of the Study:

• To evaluate eccentric fixation using OCT in a large cohort of children with residual amblyopia.
• To characterize OCT fixation shift in amblyopic and control groups.
• To compare fixation shift between anisometropic and strabismic amblyopia subtypes.

Main Methods:

• Retrospective cohort study of children aged 4-17 with and without amblyopia.
• Spectral domain OCT used to measure fixation shift in degrees.
• Comparison of fixation shift between amblyopic, fellow, and control eyes.
• Analysis of fixation shift in anisometropic versus strabismic subtypes.

Main Results:

• Significant differences in mean fixation shift were observed across groups (amblyopic, fellow, control).
• Fixation shift in amblyopic eyes correlated significantly with visual acuity.
• Fixation shift was significantly smaller in the anisometropic subtype compared to the strabismic subtype.

Conclusions:

• OCT fixation shift is a viable tool for detecting and quantifying eccentric fixation in children with residual amblyopia.
• The method is especially valuable for children with strabismic amblyopia.
• OCT fixation shift provides a convenient clinical approach for quantitative evaluation.