A comparative study of two methods of optic disc evaluation in patients of glaucoma

• Published in: Oman journal of ophthalmology Vol. 6; no. 2; pp. 103 - 107
• Main Authors: Chandra, Anuradha, Bandyopadhyay, Arun, Bhaduri, Gautam
• Format: Journal Article
• Language: English
• Published: India Medknow Publications 01.05.2013; Medknow Publications and Media Pvt. Ltd; Medknow Publications & Media Pvt. Ltd; Medknow Publications & Media Pvt Ltd; Wolters Kluwer Medknow Publications
• Subjects: Comparative studies; Cup/disc ratio; Development and progression; disc damage likelihood scale; Glaucoma; Health aspects; Medical examination; Methods; Ophthalmology; Optic disc; Original; retinal nerve fiber layer thickness; Risk factors; visual field; Oman; disc damage likelihood scale; visual field; retinal nerve fiber layer thickness; Cup/disc ratio
• DOI: 10.4103/0974-620X.116643
• ISSN: 0974-620X

Introduction: Glaucoma is a progressive disorder and requires serial evaluation in order to monitor disease progression and optimize therapy. Objective: The objective of this study was to determine the correlation between each of cup/disc (C/D) ratio and the disc damage likelihood scale (DDLS) with retinal nerve fiber layer (RNFL) and global indices in Humphrey field analyzer II (HFA II). Design: Cross-sectional study. Materials and Methods: A total of 50 patients diagnosed with primary open angle glaucoma were examined to grade DDLS score and C/D ratio. The average (avg) RNFL was obtained using the Fast RNFL protocol on optical coherence tomography (OCT) (4.0.2 Carl Zeiss). HFA II Swedish Interactive Threshold Algorithm Standard 24-2 visual fields were obtained within 1 month of clinical examination. The correlation of C/D ratio with avg RNFL thickness, Mean deviation and Pattern standard deviation was calculated by Pearson correlation coefficient (r). Similar coefficients were obtained for DDLS. Results: The P value for the difference in the r between C/D ratio with RNFL (−0.628) and DDLS with RNFL (−0.8369) was significant (P < 0.01) when correlation of C/D, DDLS with RNFL was considered. Conclusion: The DDLS shows stronger correlation with structural changes in OCT than C/D ratio. The disc diameter and rim width increases the value of clinical optic disc examination.