Influence of Corneal Diameter on Corneal Biomechanics and Biometry in Chinese Patients: A Cross-Sectional Study.
Cheng Huanmin, Li Qiwei, Yang Fan, Pazo Emmanuel Eric, Moore Jonathan E, Liu Zhanglin, Sun Ming, Zhao Shaozhen, Huang Yue
AI Summary
Corneal diameter significantly impacts biomechanical and biometry measurements; smaller corneas show abnormal Pentacam/Corvis ST values, suggesting CD inclusion improves refractive surgery screening for ectasia risk.
Abstract
Purpose
The purpose of this study was to investigate the influence of corneal diameter (CD) on corneal biomechanics and biometry parameters to allow more accurate evaluation of refractive surgery patients.
Methods
In this cross-sectional study, 203 Chinese participants were categorized into four groups based on CD (group A = CD ≤11.1 mm, group B = CD = 11.2-11.5 mm, group C = CD = 11.6-12 mm, and group D = CD >12.0 mm). Data collected included age, gender, intraocular pressure, spherical equivalent, and parameters from the Pentacam and Corvis ST. Statistical analysis was performed using SPSS software.
Results
The study included 203 eyes. For the Pentacam examination, corneal curvature, thinnest pachymetry (TP), back elevations (BEs), corneal elevation difference (front and back), pachymetry progression indices (PPIs), index of surface variance (ISV), keratoconus percentage index (KISA%), and most of the Belin/Ambrósio Enhanced Ectasia Display (BAD) parameters were negatively correlated with CD (linear regression analysis, P < 0.05). The abnormal rate of Pentacam parameters in the CD ≤11.1 mm group was higher than other groups. For Corvis ST, CD was positively correlated with peak distance (PD) and Ambrósio relational thickness to the horizontal profile (Arth), but negatively correlated with tomographic and biomechanical index (TBI) and Corvis biomechanical index (CBI; linear regression analysis, P < 0.05). The CD ≤11.1 mm group demonstrated the highest CBI and TBI values, although these parameters remained within the normal range.
Conclusions
Corneal diameter significantly influences Pentacam and Corvis ST parameters, particularly on BE, BAD-D, PPIs, CBI, and TBI.
Translational relevance: Incorporating corneal diameter into preoperative screening may help improve the specificity of keratoconus detection and reduce unnecessary exclusion of eligible refractive surgery candidates with small corneas.
MeSH Terms
Shields Classification
Key Concepts5
In a cross-sectional study of 203 Chinese participants, corneal curvature, thinnest pachymetry (TP), back elevations (BEs), corneal elevation difference (front and back), pachymetry progression indices (PPIs), index of surface variance (ISV), keratoconus percentage index (KISA%), and most of the Belin/Ambrósio Enhanced Ectasia Display (BAD) parameters were negatively correlated with corneal diameter (CD) (linear regression analysis, P < 0.05).
In a cross-sectional study of 203 Chinese participants, the abnormal rate of Pentacam parameters in the corneal diameter (CD) ≤11.1 mm group was higher than other groups.
In a cross-sectional study of 203 Chinese participants, corneal diameter (CD) was positively correlated with peak distance (PD) and Ambrósio relational thickness to the horizontal profile (Arth) from Corvis ST, but negatively correlated with tomographic and biomechanical index (TBI) and Corvis biomechanical index (CBI) (linear regression analysis, P < 0.05).
In a cross-sectional study of 203 Chinese participants, the corneal diameter (CD) ≤11.1 mm group demonstrated the highest Corvis biomechanical index (CBI) and tomographic and biomechanical index (TBI) values, although these parameters remained within the normal range.
Incorporating corneal diameter into preoperative screening may help improve the specificity of keratoconus detection and reduce unnecessary exclusion of eligible refractive surgery candidates with small corneas.
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