Prevalence and topographical characteristics of keratoconus in patients with refractive errors in the Egyptian delta.

Autor: Elbedewy HA; Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Egypt. hazemelbedewy@yahoo.com., Wasfy TE; Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Egypt., Soliman SS; Public Health and Community Medicine Department, Faculty of Medicine, Menofia University, Menofia, Egypt., Sabry MM; Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Egypt., Awara AM; Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Egypt., El Emam SY; Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Egypt., Shafik HM; Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Egypt., Alam MR; Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Egypt.
Jazyk: angličtina
Zdroj: International ophthalmology [Int Ophthalmol] 2019 Jul; Vol. 39 (7), pp. 1459-1465. Date of Electronic Publication: 2018 Jun 25.
DOI: 10.1007/s10792-018-0965-4
Abstrakt: Purpose: To study the prevalence of keratoconus (KC) and the topographical characteristics of the affected corneas in patients with refractive errors who were seeking refractive surgery in the Egyptian delta.
Methods: A retrospective study covering four and half years (Jan 2012-June 2016) where the topographical data of 8124 participants were obtained from the records of a refractive center in the Nile delta region, Egypt. The diagnosis of KC was based on the Holladay criteria in one or both eyes, using the Pentacam scans, whereas grading of KC was based on the Amsler-Krumeich classification.
Results: The prevalence of KC was 1.12% (91/8124 participants) with 95% confidence interval 0.91-1.3. Of all the affected cases, 5 cases (5.5%) had unilateral, and the other 86 cases (94.5%) had bilateral KC. The affected and unaffected subjects did not show any significant difference regarding gender. Sixty-eight (38.4%) eyes had stage 1 KC, 53 eyes (29.9%) had stage 2, 27 eyes (15.3%) had stage 3, and 29 eyes (16.4%) had stage 4 KC. It was most prevalent (1.2%) among cases with astigmatism (P < 0.001).
Conclusion: Keratoconus was found in 1.12% of patients seeking refractive surgery, with no gender preference. Most cases had bilateral affection. Astigmatism was the most common refractive error to be associated with keratoconus.
Databáze: MEDLINE
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