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Optic nerve hypoplasia: papillary diameter and clinical correlation.
Journal of Clinical Neuro-Ophthalmology
|December 1, 1985
Summary
Accurate measurement of optic nerve diameter is crucial for diagnosing optic nerve hypoplasia. This method proves more effective than traditional signs for detecting subtle reductions in disc size, especially when visual function is impaired.
Area of Science:
- Ophthalmology
- Neuro-ophthalmology
- Medical Imaging
Background:
- Optic nerve hypoplasia (ONH) diagnosis can be challenging due to subtle optic disc size reduction.
- Traditional ophthalmoscopic signs like the double peripapillary ring and low disc/artery ratio may lack sensitivity.
Purpose of the Study:
- To evaluate the efficacy of direct optic disc diameter measurement using a standardized slit-lamp method for diagnosing ONH.
- To compare the diagnostic value of direct measurement against traditional ophthalmoscopic signs.
Main Methods:
- Standardized slit-lamp examination with a posterior fundus contact lens to measure optic disc diameter.
- Evaluation of 140 normal eyes for standardization and 17 eyes with suspected ONH.
- Categorization of ONH into moderate ( -2 to -2.5 SD) and severe (< -2.5 SD) based on disc diameter.
Main Results:
- Direct measurement effectively differentiated between moderate and severe ONH cases.
- The double peripapillary ring sign was present in 2/9 moderate and 7/8 severe ONH cases.
- Low disc/artery ratio was observed in 1/8 moderate and 8/8 severe ONH cases.
- Traditional signs were less sensitive than direct measurement in detecting subtle disc diameter reductions.
Conclusions:
- Direct measurement of optic disc diameter is a more reliable method for diagnosing ONH, particularly subtle cases.
- This quantitative approach is superior to qualitative ophthalmoscopic signs for ONH detection.
- Early and accurate diagnosis is vital, as moderate ONH cases showed visual function alterations.