An innovative and simple method, clinically comparable to high-definition optical coherence tomography in quantifying posterior segment lesions in the retina

• Published in: Indian journal of ophthalmology Vol. 68; no. 5; pp. 875 - 879
• Main Authors: Koshy, Shaji, Varghese, Leena, Thomas, Satish, Thomas, Pramod
• Format: Journal Article
• Language: English
• Published: India Wolters Kluwer India Pvt. Ltd 01-05-2020; Medknow Publications and Media Pvt. Ltd; Medknow Publications & Media Pvt. Ltd; Wolters Kluwer - Medknow; Wolters Kluwer Medknow Publications
• Subjects: Contact lenses; Diagnosis; Fundus Oculi; hd-oct; Health aspects; High definition television; Horizontal cells; Humans; Lasers; Medical examination; omra-s mainster focal/grid lens; Optic disc; optic disc diameter; Optic Disk; Optics; Original; Physiological aspects; Reading; reticle; Retina; Retina - diagnostic imaging; Retinal diseases; Standard deviation; Tomography; Tomography, Optical Coherence; Tropicamide; India; Germany; OMRA-S Mainster focal/grid lens; optic disc diameter; reticle; HD-OCT
• ISSN: 0301-4738; 1998-3689
• DOI: 10.4103/ijo.IJO_1188_19

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.