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http://dx.doi.org/10.14479/jkoos.2013.18.3.279

Refractive Power Changes after Removal of Contact Lenses  

Cho, Yun-Kyung (Dept. of Optometry and Vision Science, Kyungwoon University)
Kim, Soo-Woon (Dept. of Optometry and Vision Science, Kyungwoon University)
Yu, Dong-Sik (Dept. of Optometry and Vision Science, Kyungwoon University)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.18, no.3, 2013 , pp. 279-289 More about this Journal
Abstract
Purpose: To evaluate the changes of refractive power when worn soft contact lenses were temporarily removed. Methods: 91 soft contact lens wearers (15 males and 76 females; total 182 eyes) from 17 to 39 years of age (average: $24{\pm}4.8$ years) were participated. Objective and subjective refraction, and corneal radius were measured at 0, 30, 60 and 90 min after lens removal. The changes in refractive power were evaluated between measurements over time. The other parameters such as types of lenses, fitting and wearing conditions were also assessed. Results: Objective refraction, subjective refraction and corneal radius were significantly changed according to measured time (p<0.0001). A moderate myopic shifts was observed at the beginning (30 min after lens removal) and a slight myopic shift at the late of measurement (60 min to 90 min after lens removal). There are no significant differences between lens types, fitting states, wearing time, wearing days and sleeping time in the previous day. However, there was significant interaction in changes for corneal radius between measuring time and lens type (p=0.017), fitting state (p=0.019), and sleeping time prior to the test (p=0.010). Conclusions: Time to reach refractive and corneal radius stability after contact lens removal revealed at least more than 60 min, regardless of types of lenses, fitting and wearing conditions. Therefore, refraction for correction should be performed after waiting for more than that time as possible.
Keywords
Contact lens; Refractive correction; Refraction; Refractive power; Corneal radius;
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