Purpose:This prospective cohort study aimed to assess the influence of tear film stability on corneal refractive power measurement and surgical planning in cataract patients.Methods:Participants were divided into tear...Purpose:This prospective cohort study aimed to assess the influence of tear film stability on corneal refractive power measurement and surgical planning in cataract patients.Methods:Participants were divided into tear film instability(tear film stability level 2)and control(level 0–1)groups based on Keratograph 5M results.Using IOL Master 700,two consecutive measurements were obtained with a 10-min interval.Parameters including standard keratometry(Kf,Ks and K),keratometric corneal astigmatism(KCA),total keratometry(TKf,TKs and TK)and total corneal astigmatism(TCA)were recorded.IOL power was calculated using SRK-T,SRK-T TK,Haigis,Haigis TK,Barrett Universal II,and Barrett Universal II TK formulas.Results:The results showed significantly higher differences between two measurements in Kf,K,KCA,TKf,TK,and TCA,as well as the vector variability of corneal astigmatism in the tear film instability group(all P<0.05).Of all formulas,only the SRK-T formula displayed significantly higher variability in IOL power calculations in the tear film instability group compared to the control group(P<0.05).Conclusions:This study highlights that tear film instability can lead to deviations in corneal refractive power and astigmatism measurements,contributing to increased prediction errors in IOL power calculation,particularly with the SRK-T formula.展开更多
基金supported by the 2022 Science and Technology Project of Tianjin Binhai New Area Health Commission(2022BWKQ008)Tianjin Medical University"Clinical Talent Training 123 Climbing Plan"and Tianjin Medical University Eye Hospital High-level Innovative Talent Programmer(YDYYRCXM-E2023-05).
文摘Purpose:This prospective cohort study aimed to assess the influence of tear film stability on corneal refractive power measurement and surgical planning in cataract patients.Methods:Participants were divided into tear film instability(tear film stability level 2)and control(level 0–1)groups based on Keratograph 5M results.Using IOL Master 700,two consecutive measurements were obtained with a 10-min interval.Parameters including standard keratometry(Kf,Ks and K),keratometric corneal astigmatism(KCA),total keratometry(TKf,TKs and TK)and total corneal astigmatism(TCA)were recorded.IOL power was calculated using SRK-T,SRK-T TK,Haigis,Haigis TK,Barrett Universal II,and Barrett Universal II TK formulas.Results:The results showed significantly higher differences between two measurements in Kf,K,KCA,TKf,TK,and TCA,as well as the vector variability of corneal astigmatism in the tear film instability group(all P<0.05).Of all formulas,only the SRK-T formula displayed significantly higher variability in IOL power calculations in the tear film instability group compared to the control group(P<0.05).Conclusions:This study highlights that tear film instability can lead to deviations in corneal refractive power and astigmatism measurements,contributing to increased prediction errors in IOL power calculation,particularly with the SRK-T formula.
