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KMID : 1159320180200030269
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Korean Journal of Vision Science
2018 Volume.20 No. 3 p.269 ~ p.278
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Comparison of Contrast Visual Acuity and Contrast Sensitivity according to Degree of Preoperative Refractive Errors in Refractive Surgery Patients
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Kim Jeong-Mee
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Abstract
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Purpose : To evaluate of contrast visual acuity and contrast sensitivity according to degree of preoperative myopia in refractive surgery patients.
Methods : One hundred thirty-five eyes of 68 subjects who underwent myopic refractive surgery and 40 eyes of 20 emmetropes were enrolled. High and low contrast visual acuity (HCVA and LCVA) using ETDRS charts were measured. Contrast sensitivity test was performed using CSV-1000E. Contrast visual acuity and contrast sensitivity test were performed under photopic and mesopic conditions, respectively. Post-op group was divided into two post-op groups based on pre-op spherical equivalent refractive power (SE) of ? -6.00 D and ≥-6.00 D.
Results : In contrast visual acuity, among the three groups including emmetropic group, there were significant differences in HCVA (photopic) (p = 0.028), LCVA (photopic) (p = 0.047), HCVA (mesopic) (p = 0.002) and LCVA (mesopic) (p = 0.018). There was a statistically significant difference between the two post-op groups while post-op group 2 had decreased contrast visual acuity compared to post-op group 1. In contrast sensitivity, significant differences were found at all spatial frequencies except for 6cpd with photopic condition among the three groups including the emmetropic group (photopic: 3cpd; p=0.002, 12cpd; p=0.006, 18cpd; p=0.000, mesopic: 3cpd; p=0.003, 6cpd; p=0.001, 12cpd; p=0.000, 18cpd; p=0.000). In the refractive surgery patients, there was no significant difference in the contrast sensitivity between post-op group 2 and group 1, although the contrast sensitivity of post-op group 2 was lower than that of post-op group 1.
Conclusions : The contrast visual acuity and contrast sensitivity in the refractive surgery patients was decreased compared with that of the emmetropes. In the refractive surgery groups, the contrast visual acuity decreased with high myopia of ≥-6.00 D but there was no significant difference in the contrast sensitivity between the two groups by the degree of preoperative refractive errors.
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KEYWORD
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Corneal refractive surgery , Contrast visual acuity , Contrast sensitivity
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