Evaluating reading acuity and speed in children with microstrabismic amblyopia using a standardized reading chart...

Area of Science:

• Ophthalmology
• Pediatric Vision
• Strabismus Research

Background:

• Microstrabismic amblyopia, a condition with a small angle squint (<5 degrees), affects monocular reading performance in children.
• Evaluating reading impairments requires standardized tools that offer comparable test items for accurate assessment.

Purpose of the Study:

• To assess the utility of standardized reading charts for evaluating monocular reading performance deficits in children with microstrabismic amblyopia.
• To determine if reading acuity and speed are impaired in treated microstrabismic amblyopia, even when visual acuity is normal.

Main Methods:

• 22 children with unilateral microstrabismic amblyopia underwent monocular reading evaluations using standardized charts.
• Standardized charts allowed simultaneous determination of reading acuity and speed with logarithmically graded optotypes.
• All participants were undergoing continuous amblyopia therapy.

Main Results:

• Amblyopic eyes showed significantly impaired reading acuity and maximum reading speed compared to fellow eyes (P<0.001).
• A mean inter-ocular difference in maximum reading speed of 33 words/minute indicated functionally relevant deficits.
• Reduced reading acuity (mean difference LogRAD 0.5) was observed, even in children with LogMAR 0.0 or better best-corrected visual acuity.

Conclusions:

• Microstrabismic amblyopia is linked to significant deficits in reading acuity and speed, persisting even after treatment and in the absence of acuity deficits.
• Monitoring reading performance with standardized tests is crucial for identifying and addressing functionally relevant reading impairments in treated amblyopes.
• Standardized reading charts are valuable tools for assessing reading impairments in microstrabismic amblyopia.