Scheimpflug analysis of corneal power changes after hyperopic small incision lenticule extraction

BMC Ophthalmology

Tian Han¹  Lingling Niu¹  Dan Fu¹  Jianmin Shang¹  Xiaoyu Zhang¹  Xingtao Zhou¹ 

[1] Eye Institute and Department of Ophthalmology and Vision Science, Eye & ENT Hospital, Fudan University, No.19 Baoqing Road, Xuhui District, 200031, Shanghai, China;NHC Key Laboratory of Myopia (Fudan University); Key Laboratory of Myopia, Chinese Academy of Medical Science, 20031, Shanghai, China;Shanghai Research Center of Ophthalmology and Optometry, 20031, Shanghai, China;

关键词: Cornea power;    Hyperopia;    SMILE;    TCRP;    CHM;   

DOI  :  10.1186/s12886-021-02043-w

来源: Springer

【 摘 要 】

PurposeTo assess the ability of the Pentacam in predicting the corneal power after hyperopic small-incision lenticule extraction (SMILE).MethodsTwenty-five eyes of 22 patients underwent hyperopic SMILE were prospectively followed. All patients finished at least 6 months visit. Cornea power was obtained by Pentacam HR, in the format of mean keratometry (Km), equivalent keratometry (EKR) and total cornea refractive power (TCRP). Calculation of TCRP were centered on either the corneal apex or the pupil center within a ring or zone, giving a total of four different subtypes naming AR、AZ、PR、PZ. Clinical history method (CHM) was regarded as a gold standard and was compared with other cornea power parameters.ResultsCenter difference had no impact on the TCRP values (PR vs AR and PZ vs AZ, P > 0.05). Compared with CHM, no difference was found in Km, EKR 4.0 mm, EKR 4.5 mm, PR 3.0 mm, PR 4.0 mm, AR 3.0 mm and AR 4.0 mm. PR 4.0 mm showed the least difference with CHM (− 0.14 ± 1.03D, P > 0.05). The 95% limit of agreement (LOA) of the TCRPs and CHM was not close. The top two were PR 3.0 mm and PR 4.0 mm, LOA of which were − 2.20 to 1.84 D and − 2.18 to 1.68 D respectively. Central cornea thickness was correlated with error (TCRP – CHM) of PR 4.0 mm (r = 0.58, P = 0.003).ConclusionsThe Pentacam topographer is an alternative method of measuring corneal power in eyes after hyperopic SMILE. The optimal options seem to be the TCRP (PR 4.0 mm). The agreement needs more verifications.

【 授权许可】

CC BY