Effect of Pterygium Size on Astgmatism and Corneal Topography Before and After Surgery
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Abstract
Background:
Objective: To analyze the association between pterygium size with astigmatism and corneal topography changes before and after surgery.
Methods: This study was conducted at Dr. Soetomo General Hospital and Surabaya Eye Clinic on February-June 2013. In 31 eyes of 20 patients with primary pterygium, size of pterygium was measured in millimeters from the limbus (horizontal length) by caliper and the beam of slit lamp microscope. Twenty four eyes with pterygium type 2 and 3 were excised with bare sclera technique and intraoperative MMC application. Astigmat and corneal topography was investigated with the help of Orbscan preoperatively and 4-6 weeks postoperatively.
Result: The size of pterygia had a significant correlation on the elevation of the preoperative corneal astigmatism and irregularities (p<0.001). The mean Sim K astigmatism (p=0.005) and irregularity index (<0.001) significantly decreased after pterygium surgery. The mean refractive power significantly increased after the operation (p<0.001).
Conclusion: Pterygium leads to significant changes in corneal refractive status, which increase with the increase in the size of pterygia and improve following pterygium surgery.
Keywords: Pterygium, astigmatism, corneal topography
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References
Seitz, B, Gutay, A, Kuchle, M, Kus, MM, & Langenbucher, A 2001, ‘Impact of pterygium size on corneal topography and visual acuity -a prospective clinical cross-sectional study’, Klin Mobl Augenheilkd, vol. 218, no. 9, pp. 609-615.
Yilmaz, S, Yuksel, T, & Maden, A 2008, ‘Corneal topographic changes after four types of pterygium surgery’, Journal of Refractive Surgery, vol. 24, no. 2, pp. 160-165.
Gazzard, G, Saw, SM, Farook, M, Koh, D, Widjadja, D, Chia, SE, Hong, CY, & Tan, DT 2002, ‘Pterygium in Indonesia: prevalence, severity and risk factors’, Br J Ophthalmol, vol. 86, pp. 1341-1346.
Tan, C, Lim, T, Koh, W, Liew, G, Hoh, S, Tan, C, & Eong, K 2006, ‘Epidemiology of pterygium on a tropical island in the Riau archipelago’, Eye, vol. 20, pp. 908-912.
Primitasari, Y & Prajitno, S 2012, Penyakit mata pterigium dan faktor-faktornya pada perserta posyandu lansia dan ibu-ibu PKK di kecamatan Bareng kabupaten Jombang, viewed 22 Agustus 2012, http://penelitian.unair.ac.id/ artikel/4944bc c333cb71ad20fb1b75f9a7d760_Unair.pdf
Oh, YJ & Wee, WR 2010, ‘The effect of pterygium surgery on contrast sensitivity and corneal topographic changes’, Clinical Ophthalmology, vol. 4, pp. 315–319.
Maheshwari, S 2007 ‘Pterygium-induced corneal refractive changes’, Indian J Ophthalmol, vol. 55, pp. 383-386.
Kheirkhah, A, Safi, H, Nazari, R, Kaghazkanani, R, Hashemi, H, & Behrouz, MJ 2012, ‘Effects of pterygium surgery on front and back corneal surfaces and anterior segment parameters’, Int Ophthalmol, vol. 32, pp. 251-257.
Turan-Vural, E, Torun-Acar, B, Kivanc, SA, Acar, S 2011, ‘The effect of topical 0.05% cyclosporine on recurrence following pterygium surgery’, Clinical Ophthalmology, vol. 5, pp. 881-885.
Suhendro, G 2004, ‘Preserved amniotic membrane graft after bare sclera technique with Mitomycin C for pterygium surgery’, Folia Medica Indonesiana, vol. 40, no. 3, p. 99.
Alpay, A, Uğurbas, SH, & Erdoğan, B 2009, ‘Comparing techniques for pterygium surgery’, Clinical Ophthalmology, vol. 3, pp. 69–74.
Yousuf, M 2005, ‘Role of pterygium excision in pterygium induced astigmatism’, JK-Practitioner, vol. 12, no.2,pp.91-92