Abstract
Purpose :
Comparison of ocular biometric measurements for axial length (AL), corneal power, central corneal thickness (CCT), keratometry (K), anterior chamber depth (ACD), white-to-white (WTW) and calculation of intraocular lens power with two new devices, one that uses Scheimpflug technology combined with partial coherence interferometry (Pentacam AXL) and the other that uses sweptsource OCT (IOL Master 700) in Mexican patients with cataract diagnosis.
Methods :
It is a prospective, cross-sectional, comparative study with reliability analysis of the instruments. The exclusion criteria for the study were patients under 18 years old, patients with white mature or traumatic cataracts and patients with central corneal opacities due to the possibility of measurement errors, alterations in the anterior segment such as subluxation or dislocation of the lens, a history of previous ocular surgery in the same eye of the study. In all eyes, ocular biometrics was measured with the IOL Master 700 and compared with the Pentacam AXL. Also, calculation of intraocular lens power, using Haigis, SRK/T, Hollyday2 and Barret Universal II formulas was performed.
Results :
Our study sample included 48 eyes of 24 patients with cataract diagnosis, 50% were female and 50% were male. Mean age was 70.58 +/- 9.64 years. The mean and standard deviation for biometrics using IOL Master 700 and Pentacam AXL devises respectively were AL 23.74+/-0.80; 23.32+/-0.35, ACD 3.27+/-0.63; 2.82+/-0.54, CCT 519.18+/-113.869;538+/-30.75, SE 43.72+/-1.62; 43.46+/-1.63, K1 43.16+/-1.54; 42.90+/-1.51, K2 44.31+/-1.85; 44.07+/-1.88, astigmatism -1.12+/-0.98; -1.15+/-0.95, WTW 11.74+/-0.32; 11.60+/-0.54. Following the calculation of IOL power (Acrysoft. IQ monofocal SN60WF), the value of diopter power closest to emmetropization was collected. The mean and standard deviation IOL power calculated were Haigis 20.30+/-2.11; 21.66+/-1.74, Holladay 20.52+/-2.18; 21.47+/-1.56, SRK/T 20.30+/-1.96; 21.33+/-1.52, Barret Universal II 20.21+/-2.06; 21.19+/-1.58.
Conclusions :
There is no statistically significant difference in the biometric results by the two refence devices, as well as in the intraocular lens power calculation, however the main limitation of the study is a small sample of patients.
This is a 2020 ARVO Annual Meeting abstract.