![]() Stability of astigmatism, keratometric parameters and improvement in BCVA in our study indicates the efficacy of CXL to prevent progression in PMD. High-resolution optical coherence tomography corroborated the clinical findings, and the patient was diagnosed with pellucid marginal corneal degeneration (PMD). Collagen cross linking is a safe and effective method to prevent progression in PMD. Corneal topography showed against-the-rule astigmatism with mean keratometry (Km) of 45.1 and 45.2 dioptres in the right and left eyes, respectively. None of the treated eyes developed side effect of notable severity. They evaluated corneal elevation and thickness in pa. Keratometric astigmatism decreased by 1.13 D (P = 0.2) measured by Scheimpflug imaging and by 1.4 D (P = 0.13) as measured by topography. between pellucid marginal degeneration (PMD) and keratoconus with the aid of corneal topography. There was no significant difference in the pre and post-op spherical equivalent (P = 0.38) and the mean cylinder decreased by 0.53 ± 0.81 D (P = 0.19) which was not significant. logMAR UCVA (uncorrected visual acuity) and BCVA (best corrected visual acuity) with spectacles at 6 months and at final follow-up showed improvement in all groups, which were significant in group C. Visual acuity, retinoscopic refraction, corneal topography, tomography and pachymetry were examined before and every six months after surgery for the first two years and then annually. The eyes were divided as per riboflavin used namely hypo-osmolar, HPMC (hydroxy propyl methyl cellulose), iso-osmolar into group A, B and C respectively. It may slowly grow but rarely grows so large that it covers the pupil and impairs vision. It typically starts on the cornea near the nose. A retrospective interventional study involving 15 eyes of 10 patients with pellucid marginal degeneration (PMD) were treated with collagen cross linking (CXL) to evaluate itslong term effects on such patients. A pterygium of the eye (plural pterygia or pterygiums, also called surfers eye) is a pinkish, roughly triangular tissue growth of the conjunctiva onto the cornea of the eye.
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