Changes in Corneal and Anterior Chamber Parameters following myopic Transepithelial photorefractive keratectomy
Purpose: To compare changes in the value and location of the corneal thinnest point, anterior chamber depth (ACD), anterior chamber volume (ACV) and iridocorneal angel after myopic transepithelial photorefractive keratectomy (tPRK) by CSO Sirius imaging device.
Materials and Methods: In this prospective comparative case series, 56 myopic eyes scheduled for tPRK in Tishreen University Hospital, underwent CSO SIRIUS imaging before and 6 months after the operation to compare changes in the value and location of the corneal thinnest point, (ACD), (ACV) and iridocorneal angel.
Results: The mean age of the patients was 26.58 ± 6.47 years (range 18-49 years). The spherical equivalent of refraction was -2.23 ± 1.38 diopter (range -0.6 , -7.50 diopter). The mean difference in ACV is -3.68±6.25 mmᵌ (p-value=0.0001). The mean difference in ACD is -0.15±0.13 mmᵌ (p-value=0.001). The mean difference in the thickness of the corneal thinnest point is -52.88±27.7 microns (p-value=0.0001). The change in the location of the corneal thinnest point according to the center of the cornea = -0.14 mm (p-value=0.001). The iridocorneal angle didn’t change.
Conclusion: Thickness of the corneal thinnest point, ACV and ACD decreased and the location of the corneal thinnest point changed after myopic tPRK. The iridocorneal angle didn’t change.
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