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Eye patching and visual evoked potential acuity in children four months to eight years old
Insights
Visual evoked potentials (VEPs) assessed visual acuity in children undergoing patching therapy. Patching temporarily decreased acuity in the patched eye but improved the other, with no permanent harm observed.
Area of Science:
- Ophthalmology
- Pediatric Optometry
- Neuroscience
Background:
- Amblyopia, or
- lazy eye
- is a common cause of reduced vision in children.
- Patching therapy is a standard treatment for amblyopia.
- Visual evoked potentials (VEPs) offer an objective measure of visual acuity.
Observation:
- Monocular visual acuities were measured using VEPs in children aged 4 months to 8 years before and during patching therapy.
- VEP acuity was found to be comparable to Snellen acuity in a cooperative child.
- The study involved seven children, with detailed measurements before and after patching.
Findings:
- In children under 3 years, patching decreased acuity in the patched eye by 1.8 octaves and improved the unpatched eye by 2.0 octaves.
- Following patching cessation, the previously patched eye improved by 2.0 octaves, while the other eye declined by 1.75 octaves.
- In children over 4 years, patching resulted in a 1.25-octave decrease in the patched eye, with similar improvement upon cessation.
Implications:
- Patching therapy demonstrates temporary, reversible effects on visual acuity in children with amblyopia.
- VEPs provide a reliable method for assessing visual acuity in young children who cannot cooperate with standard eye charts.
- The study suggests that patching therapy does not cause permanent vision loss and can lead to significant visual improvements.
Abstract:
The monocular visual acuities of six children aged 4 months to 8 years were measured using visual evoked potentials (VEP's) before and during patching therapy. A seventh child had both Snellen and VEP monocular acuities determined before patching. In a cooperative child, it was estimated that VEP acuity was within 0.25 octaves (one line on an eye chart) of Snellen acuity. In the four children less than 3 years of age, patching resulted in a 1.8-octave decrease in acuity of the patched eye and a 2.0-octave improvement in the unpatched eye. After cessation of patching therapy, acuity of the previously patched eye improved 2.0 octaves and that of the abnormal eye declined 1.75 octaves. In the two children older than 4 years, patching resulted in 1.25-octave acuity decrease in the patched eye. Cessation of patching resulted in a 1.25-octave improvement in acuity of the patched eye. No permanent deleterious effects of patching on acuity were observed.