1.Correlation of optic-disc area and refractive error
Eileen Faye S. Enrique ; Mario M. Yatco ; Noel M. Castillo
Philippine Journal of Ophthalmology 2009;34(2):56-58
Objective:
This study measured the optic-disc area using optical coherence tomography
(OCT) and correlated it with the type of refractive error.
Methods:
A cross-sectional study was conducted involving 73 healthy Filipinos aged 20
to 60 years. All underwent a full ophthalmologic examination including visual
acuity, automated refraction, Goldmann applanation tonometry, and dilatedfundus examination. Fast optic-nerve-head imaging was performed with 6 radial
linear scans centered on the optic-nerve head.
Data were tabulated and the association between optic-disc measurements
and refractive error was analyzed using analysis of variance and linear
regression.
Results:
A total of 142 eyes of 73 patients were included, of which 39 (27.5%) were
classified as emmetropia or hyperopia, 47 (33%) as low myopia, 37 (26.2%) as
moderate myopia, and 19 (13.4%) as high myopia. The mean refractive error
was –9.2 ± 2.98D for those with high myopia, –4.7 ± 0.74D for moderate myopia,
–1.7 ± 0.78D for low myopia, and 1.1 ± 2.55D for emmetropia and hyperopia.
The mean optic-disc area for all groups was 2.70 ± 0.59 mm2 (range, 1.6 to 4.7
mm2
); the mean optic-disc area was similar for high myopia (2.7 ± 0.57 mm2
)
and low myopia (2.7 ± 0.52 mm2
). There was no significant difference in the
optic-disc area of the different types of refractive errors (p = 0.30).
Conclusion
This study showed that the optic-disc area is statistically independent of the
refractive error.
Emmetropia Hyperopia Myopia Tomography
;
Optical Coherence