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Estimation of optic disc size using indirect biomicroscopy

¹Glaucoma Unit, Moorfields Eye Hospital, London.

The British Journal of Ophthalmology

|May 1, 1994

Summary

Estimating optic nerve head size using a 90 dioptre fundus lens with slit-lamp biomicroscopy is a quick clinical method. While convenient, this technique provides an estimate and cannot replace precise optic disc planimetry.

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Area of Science:

Ophthalmology
Optometry
Biomedical Optics

Background:

Accurate measurement of optic nerve head size is crucial for diagnosing and monitoring various ocular conditions.
Traditional methods like optic disc planimetry can be time-consuming and require specialized equipment.

Purpose of the Study:

To evaluate the reliability and accuracy of using a 90 dioptre fundus lens with slit-lamp biomicroscopy for estimating optic nerve head size.
To compare measurements obtained via this method with those from planimetry and determine a conversion factor.

Main Methods:

A series of 37 patients underwent optic nerve head size estimation using a 90 dioptre fundus lens and Haag-Streit slit-lamp.
Measurements were compared with values obtained through planimetry to assess the conversion factor and method reliability.

Main Results:

The 90 dioptre fundus lens and slit-lamp biomicroscopy technique provides a quick and easily accessible method for estimating optic nerve head size in a clinical setting.
The study established a conversion factor for this method, though its accuracy is limited compared to planimetry.

Conclusions:

The 90 dioptre fundus lens method is a practical tool for rapid, in-clinic estimation of optic nerve head size.
This technique serves as a useful preliminary assessment but does not substitute for the precision of optic disc planimetry for definitive measurements.

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