B/F Ratio、中央角膜厚度对SimK和TCRP一致性的影响

doi:10.3760/cma.j.cn115909-20210523-00207

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Abstract Objective: To evaluate the effects of the back-front corneal radius ratio (B/F Ratio) and central corneal thickness (CCT) on the consistency of the simulated keratometry (SimK) and total corneal refractive power (TCRP) in normal corneal patients with cataract. Methods: This retrospective analysis focused on the clinical data of 202 patients with cataracts and a normal cornea who underwent phacoemulsification with intraocular lens implantation in Shanxi Eye Hospital from September 2019 to January 2020. Corresponding measurement results of preoperative Pentacam HR anterior segment analyzer were analyzed, including the corneal SimK, TCRP, B/F Ratio, CCT and △Km (△Km=SimK-TCRP), which is the difference between SimK and TCRP, in the central 4 mm area of the pupil. Only 1 eye from each patient was selected, and if the patient had binocular surgery, a random eye was chosen by tossing a coin. Then, a paired samples t-test on SimK and TCRP data was conducted on the measurement results of the Pentacam HR anterior segment analyzer. Pearson correlation analysis was applied to evaluate the correlation of CCT and B/F Ratio with △Km, followed by the establishment of the multiple linear regression equation. Results: The mean values of corneal SimK, TCRP, △Km, B/F Ratio and CCT in 202 patients were 44.45±1.51 D, 44.34±1.59 D, 0.11±0.30 D, 82.04%±1.52%, and 537±30 μm, respectively. △Km=0 D accounted for 12.4% of the difference between SimK and TCRP, which was significant (t=5.2, P<0.001). The B/F Ratio and CCT were negatively correlated with △Km (r=-0.22, P<0.001; r=-0.172, P=0.014). The linear regression equation of the B/F Ratio, CCT and △Km was △Km=6.882-6.549×B/F Ratio-0.003×CCT (R2=0.13; F=14.90, P<0.001). Conclusions: There is a divergence between SimK and TCRP, which is negatively correlated with the B/F Ratio and CCT. The SimK will exceed the TCRP which can cause the hyperopia shift based on △Km, if the B/F Ratio and CCT are too small.

Key words： cornea total corneal refractive power corneal thickness back-front corneal radius ratio

Received: 23 May 2021

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Fund:Research Project of Shanxi Eye Hospital (Q201902)

Corresponding Authors: Wanmin Wu, the Second Cataract Department of Shanxi Eye Hospital, Taiyuan 030000,China (Email: 603313473@qq.com)

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	Wanmin Wu
	Feiyan Chai
	Jiewei Liu

Cite this article:

Wanmin Wu,Feiyan Chai,Jiewei Liu. The Influence of B/F Ratio and Central Corneal Thickness on the Consistency of SimK and TCRP[J]. Chinese Journal of Optometry Ophthalmology and Visual science, 2022, 24(3): 216-220.

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https://www.cjoovs.com/EN/10.3760/cma.j.cn115909-20210523-00207 OR https://www.cjoovs.com/EN/Y2022/V24/I3/216

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