Comparison of Central Corneal Thickness Measurement with Pentacam and Ultrasound

Purpose: Thre purpose of this study was to compare central corneal thickness (CCT) measurements obtained with a novel rotating Scheimpflug camera, ALLEGRO Oculyzer(Pentacam)Version 1074; Allergo,Germany with ultrasound pachymetry (Sonoscan model 4000AP,SONOMED,USA).Me/AofiS:CCT in 117 healthy eyes of (64 egyptian patients) seeking for refractive was measured with each modality by one observer .At least three measurements are taken for each eye and the average number for CCT is included in the study. For the rotating Scheimpflug camera,only images with Quality specification (QS):OK were includedin the study. Results:The mean central corneal thickness by ultrasound pachymetry was 552.1 ^ ± 43.96^ standard deviation and by Pentacam 541.82 ^ ± 39.87 ^standard deviation with correlation of 0.892 (P value < 0.01 ) implying a hightly significant correlation but with slightly lower values (by about 8.60^ ± 14.1 ) obtained by Pentacam with no significant difference attributed to age or sex of the patients. Conclusion:In the assessment of normal corneas, the Pentacam measured CCT values close to ultrasound pachymery with tendency for slightly lower values without significant differences attributed to age or sex therefore,it is considered as valid in determining central corneal thickness as ultrasound pachymetry with other advantages over the ultrasound pachymetry