Morphological And Morphometric Characteristics Of The Optic Disc And Retinal Nerve Fiber Layer In Healthy Patients Evaluated By Optical Coherence Tomography At Clínica La Luz: Original Article

Ana Luisa González Méndez

doi:10.58372/2835-6276.1192

Authors

Ana Luisa González Méndez

DOI:

https://doi.org/10.58372/2835-6276.1192

Keywords:

Megalopapilla, Optical coherence tomography, Optic disc

Abstract

Objective: To characterize the morphological and morphometric parameters of the optic disc and retinal nerve fiber layer (RNFL) in healthy patients studied using optical coherence tomography.

Materials and Methods: Descriptive, prospective, cross-sectional study. 252 eyes of 126 patients who attended ophthalmological evaluation at Clínica La Luz in Lima, Peru, from October 2022 to July 2023 were evaluated. Using the ZEISS CIRRUS TM HD OCT Model 5000 optical coherence tomography (Carl Zeiss Inc., Dublin, CA, USA), morphological and morphometric parameters of the optic disc and RNFL thickness were measured. Megalopapilla was defined as an optic disc area > 2.5mm2 and larger than the mean plus 2 standard deviations.

Results: In patients without megalopapilla, the optic disc area was 2.05 ± 0.29mm2, rim area 1.29 ± 0.19mm2, cupping 0.63 ± 0.48 mm2; average cup/disc ratio 0.58 ± 0.13, vertical cup/disc ratio 0.55 ± 0.12, and RNFL thickness 95.99 ± 8.63mm2. The prevalence of patients without megalopapilla was 67% considering an optic disc area <2.5mm2.

In patients with megalopapilla, the optic disc area was 2.87 ± 0.30mm2, rim area 1.36 ± 0.21mm2; average cup/disc ratio 0.71 ± 0.07, vertical cup/disc ratio 0.67 ± 0.07, and RNFL thickness 99.13 ± 8.71mm2. The prevalence of megalopapilla was 33%, considering an optic disc area > 2.5mm2. When comparing megalopapillae with normal discs, the rim area (p < 0.001) and RNFL thickness (p = 0.78) showed no statistically significant differences.

Conclusion: The results showed that the disc area was 2.05 ± 0.29mm2, with CFNR thickness 95.99 ± 8.63mm2. The prevalence of megalopapilla was 32% and 8%, with disc area > 2.5mm2 and 3.07mm2 respectively. The values in terms of ring area and CFNR thickness are similar in megalopapilla and normal discs.

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