A Comparative Study on Pain Intensity and Visual Acuity Following Photorefractive Keratectomy Surgery Through Two Types of Contact Lenses: Johnson & Johnson and Night & Day



Razmju H¹ ; Atashkadi S² ; Abtahi SM³ ; Akbari M⁴ Show Affiliations
Source: Journal of Isfahan Medical School Published:2011

Abstract

Background: Photorefractive keratectomy (PRK) is a method whose impact on elimination of refractive disorders has been evaluated in conducted studies. This study aimed to compare pain intensity and visual acuity following photorefractive keratectomy surgery using two types of contact lenses, i.e. Johnson and Johnson and Day and Night lenses. Methods: This clinical trial study was conducted in Feiz University Hospital affiliated to Isfahan University of Medical Sciences, Isfahan, Iran during June-September 2011. The statistical population included patients with refractive disorders who underwent PRK surgery. Convenient simple sampling method was used to select subjects. Patients were divided into a group with Johnson and Johnson lenses and another group with Day and Night lenses. Thereafter, their visual acuity and epithelial defect size were identified and compared. The data was analyzed in PASW (SPSS)18. Paired t-test was used to compare the results of visual acuity before and after the employment of lenses in the two groups. Independent t-test and chi-square test were used to compare the two groups at all times. Findings: In this study, 44 patients were evaluated. The mean age of the patients was 27.18 ± 3.90 years. The mean pain intensity of the patients with Johnson and Johnson lenses on the first, third, and fifth days after the surgery was 0.98 ± 1.17, 0.57 ± 0.87, and 0.11 ± 0.32, respectively. The corresponding values in patients with Day and Night lenses were 2.5 ± 0.97, 1.4 ± 1.0, and 0.59 ± 0.62. Mann-Whitney test showed a significant difference between pain intensity in the two groups (P = 0.0001). The mean visual acuity of patients with Johnson and Johnson lenses on the first, third, and fifth days after the surgery was 6.68 ± 2.68, 5.57 ± 1.70, and 7.07 ± 1.56, respectively. The corresponding values in patients with Day and Night lenses were 6.98 ± 2.28, 5.36 ± 2.04, and 7.39 ± 1.6. Analysis of variance (ANOVA) showed no significant difference between the two groups in terms of visual acuity on the first, third, and fifth days after the surgery (P = 0.67). Conclusion: It seems that probably the pain intensity after the surgery was better using Johnson and Johnson lenses. However, visual acuity had no difference using different lenses. Therefore, it is recommended to use Johnson and Johnson lenses in patients who do not have necessary collaboration or have lower pain tolerance. © 2011, Isfahan University of Medical Sciences(IUMS). All rights reserved.