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Optic tract syndrome with relative afferent pupillary defect
Japanese Journal of Ophthalmology
|January 1, 1991
Summary
Relative afferent pupillary defect (RAPD) detection aids in distinguishing optic tract lesions from other causes of complete homonymous hemianopia. This finding is crucial for accurate diagnosis and targeted treatment strategies.
Area of Science:
- Ophthalmology
- Neuroscience
- Neuro-ophthalmology
Background:
- Optic tract lesions can present with complete homonymous hemianopia, posing diagnostic challenges.
- Differentiating optic tract lesions from suprageniculate lesions is critical for patient management.
Observation:
- Two cases of optic tract lesions with complete homonymous hemianopia were analyzed.
- Both cases exhibited characteristic optic atrophy, retinal nerve fiber bundle defects, and relative afferent pupillary defect (RAPD).
Findings:
- Relative afferent pupillary defect (RAPD) was consistently detected, measuring 0.6 log units.
- Infrared pupillography showed ipsilateral pupillary light response to be 1.2-1.3 times higher than contralateral.
Implications:
- The presence and measurement of RAPD are valuable indicators for identifying optic tract lesions.
- This diagnostic approach can help differentiate optic tract lesions from suprageniculate lesions in cases of homonymous hemianopia.