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An innovative and simple method, clinically comparable to high-definition optical coherence tomography in quantifying
Shaji P Koshy1, Leena Mariyam Varghese1, Satish Thomas1
1Department of Ophthalmolgy, Believers Church Medical College Hospital, Kuttapuzha, Thiruvalla, Kerala, India.
Purpose:
To introduce a simple and inexpensive method using a fundus contact lens and a reticle, to measure retinal lesions comparing it with values obtained with high-definition optical coherence tomography (HD-OCT). This study considers optic disc as the object for comparison.
Methods:
: Patients underwent routine ophthalmologic examination and their horizontal optic disc diameter was measured, both with the reticle and OCT. For measurement with reticle a simple equation was deduced, x = 0.7y, where x corresponds to the actual image size and y to the reticle scale reading in millimeters.
Results:
: An aggregate of 127 eyes of 75 patients were dilated and examined. The calculated mean diameter according to OCT was 1.639 mm (standard deviation = 0.179) and that assenting to reticle was 1.713 mm (standard deviation = 0.175), with a difference in mean being 0.089 mm.
Conclusion:
Values obtained by this new method was found to be comparable with the OCT values for retinal measurements, useful for ophthalmologists who cannot afford expensive and sophisticated machines.
