The Influence of Horizontal Corneal Diameter on Corneal Tomography and Belin/Ambrósio Enhanced Ectasia Display of Pentacam Corneal Tomography
Mohamed Harras *
Department of Ophthalmology, Faculty of Medicine, Tanta University, Egypt and Kafr-Elsheikh Ophthalmology Hospitals, Egypt.
Said Mohamed Shalaby
Department of Ophthalmology, Faculty of Medicine, Tanta University, Egypt.
Hazem Elbedewy
Department of Ophthalmology, Faculty of Medicine, Tanta University, Egypt.
Mohamed Elkadim
Department of Ophthalmology, Faculty of Medicine, Tanta University, Egypt.
*Author to whom correspondence should be addressed.
Abstract
Aims: To detect the influence of WTW on corneal tomography parameters and Belin/Ambrósio Enhanced Ectasia Display indices.
Study Design: interventional, retrospective, non-controlled, non-comparative study.
Place and Duration of Study: Department of ophthalmology (Tanta university) and Eshrak Eye Hospital, between January 2019 and December 2021.
Methodology: we collected the preoperative Pentacam images of 126 patients (252 eyes) underwent Laser Vision Correction. Correlations were performed between WTW and Pentacam findings (anterior, posterior K readings, anterior, posterior Astigmatism, Thinnest location (TL), and BAD indices: Db, Db, Dt, Da, Dp, D).
Results: WTW shows a negative correlation with KM (P = < 0.001; r = -0.43), posterior KM (P = < 0.001; r = -0.51), Kmax (P = < 0.001; r = -0.43), posterior corneal astigmatism (P = 0.002; r = -0.218) and TL (P = 0.012; r 34 = -0.17), and a positive correlation with anterior corneal astigmatism (P = 0.038; r = 0.148), There was a negative correlation between the corneal diameter and Db (r = - 0.35 ; P = <0.001), Dp (r = - 0.09 ; P = 0.02) and with final (D) (r = - 0.16; P = <0.095) and a positive correlation with Dt (r=+0.25. P =0.003).
Conclusion: Corneal diameter influences corneal curvature and pachymetry. It also influences BAD display; small diameter is associated with steep cornea and can give a false impression of corneal ectasia in BAD display.
Keywords: Cornea, pentacam, Belin/Ambrósio