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Evaluating reading acuity and speed in children with microstrabismic amblyopia using a standardized reading chart
E Stifter1, G Burggasser, E Hirmann
1Department of Ophthalmology, Medical University of Vienna, Austria.
Insights
Standardized reading charts effectively evaluate reading impairments in children with microstrabismic amblyopia. Even with good visual acuity, reading speed and acuity remain significantly impaired in amblyopic eyes.
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.
Background:
To examine if standardized reading charts with highly comparable test items can be used for evaluating impairments in the monocular reading performance of children with microstrabismic amblyopia characterized by a small angle of squint with less than 5 degrees.
Methods:
The reading performance of 22 children (mean age: 11.7+/-1.6 years) with unilateral microstrabismic amblyopia was evaluated monocularly in both eyes, using standardized reading charts for the simultaneous determination of reading acuity and speed. The print sizes of the highly comparable sentence optotypes were logarithmically graded, providing constant geometric proportions for all testing distances in order to control contour interaction. All children were under continuous amblyopia therapy.
Results:
In the amblyopic eyes, reading acuity and maximum reading speed were significantly impaired when compared to the sound fellow eyes (P<0.001). In respect of the maximum reading speed, a mean inter-ocular difference of 33+/-19 words per minute was found, revealing functionally relevant deficits in monocular reading performance. The amblyopic eyes achieved only a significantly reduced reading acuity (mean inter-ocular difference: LogRAD 0.5+/-0.24; P<0.001). In eight children, the amblyopic eyes achieved a best-corrected visual acuity of LogMAR 0.0 or better: in respect of the visual acuity, there was no significant inter-ocular difference, but reading acuity and maximum reading speed were significantly impaired when compared to the fellow eyes.
Conclusions:
Microstrabismic amblyopia was associated with significant impairment of reading acuity and speed in treated amblyopes, even in those with no persistent acuity deficit. To improve treatment addressing these functional deficits, reading performance should be monitored over time using standardized reading tests, which provide essential information about functionally relevant reading impairments.
