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First Author: C.Tabatabay SWITZERLAND
Co Author(s): C. Liernur
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The purpose of this study is to determine whether the use of Tetracaine drops as a pain reliever in the immediate post-PRK treatment period is related to the duration of contact lenses wearing by the patient prior to refractive surgery.
The study was conducted on 420 eyes of 214 patients that underwent PRK refractive surgery from March 2004 to December 2012. Pre-operative spherical myopia was ranging from -1.0 to -10.0 dioptres. Patients were aged between 19 and 55. PRK was performed with a Nidek 5000 Excimer laser. At the end of the procedure, the group of 214 patients was given one single-use unit of Tetracaine to ease their pain, if necessary.
Patients of total study group were divided into 4 sub-groups: non-users of contact lenses; users up to 5 years pre-op; users from 5 to 10 years pre-op; users above 10 years pre-op. How many patients of the total study group used Tetracaine drops post-op? For how long have the patients weared contact lenses prior to PRK surgery? Is there a correlation between the duration of contact lenses wearing and the degree of pain, further so the need of Tetracaine drops?
2/3 of the total study group used Tetracaine drops in the immediate post-PRK period. Within the 4 different sub-groups of the total study group, there was no significant correlation between mid and long-term contact lenses wearers, or short term and non-users of contact lenses and degree of post-op pain and, thus, the need of Tetracaine drops. Moreover, Tetracaine use did not delay corneal re-epitheliation when compared to non-users. Pre and post-PRK treatment contrast sensitivity was comparable in both groups of users and non-users. No post-op retinal complications have been observed in any of the study groups.
Duration of contact lenses wearing prior to PRK refractive surgery does not seem to have a correlation with the degree of uncomfort and immediate post-operative pain. Therefore, based on this sole information, the need of Teteracaine in the immediate post-operative period cannot be predictable.