Comparing spectacle and toric contact lens prescribing trends for astigmatism
Authors Chu BS, Boon MY, Noh DH
Received 4 March 2018
Accepted for publication 23 August 2018
Published 8 November 2018 Volume 2018:10 Pages 119—127
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Mr Simon Berry
Byoung Sun Chu,1 Mei Ying Boon,2 Dong Hwan Noh3
1School of Optometry and Vision Science, Daegu Catholic University, Hayang-eup, Gyeongsan-si, Gyeongsangbuk-do, Republic of Korea; 2School of Optometry and Vision Science, University of New South Wales, Sydney, Australia; 3DAVICH Optical Chain, Daechi-dong, Gangnam-gu, Seoul, South Korea
Background: The purpose of this study is to investigate and compare spectacle and contact lens (CL) prescription trends, with an emphasis on astigmatic refractive error prescribing differences for patients who purchase spectacles or CLs in South Korea.
Methods: A retrospective study of patient records of a major optical chain in South Korea was conducted. De-identified data of age, gender, power of prescribed spectacles and/or CLs were extracted from the practice database. Inclusion criteria were being within the first 10,000 purchasers of spectacles or CLs or both.
Results: The first 10,000 purchases comprised spectacles (59%) and CLs (41%) (male:female ratio 4:6). The proportion of purchasers who were female was significantly higher for CLs (88% female, 12% male) than spectacles (43% female, 57% male) (χ2=4480.36, df=1, P<0.0001). There was a significant difference in the proportions of purchases by age group for spectacles and CLs (χ2=3246.69, df=3, P<0.0001). Spherical power distribution of prescribed lenses was similar between the groups; however, cylinder power and axis were significantly different (P<0.0001). CL astigmatic powers were more likely to be 1.00 DC or greater, whereas the majority of spectacle lenses had astigmatic power of 0.75 DC or less. In total, 90% of toric CLs were prescribed ×180 and 9% other meridians, unlike spectacles where 50% were prescribed ×180, 14% ×90 and 40% at oblique meridians.
Conclusion: There is scope for providing increased toric lens correction amongst CL wearers and increasing the proportion of wearers who are male. The estimated gap for toric lens prescription amongst CL wearers who have clinically significant astigmatism ≥0.75 DC is about 59%.
Keywords: astigmatism, toric contact lens, coverage, prescribing gap, spectacle correction, demographics
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