الفهرس 
Anatomy of CorneaOnly 14 pages are availabe for public view
 |  | from | 69 |  |  |
| | | from | 69 | | |
Abstract
: Central corneal thickness is a critical parameter in corneal evaluation for a wide range of purposes in ophthalmology such as refractive surgeries including LASIK, cataract surgeries to assess endothelial pump function preoperatively to preserve the corneal transparency, and glaucoma in terms of diagnosis, management and follow up to avoid over/underestimation of intraocular pressure due to variations in CCT.
Aim of the Work: The study will investigate the discrepancy in measuring the CCT between Scheimpflug imaging using the Nidek AL-Scan and optical pachymetry using the Nidek Specular Microscope CEM-530.
Patients and Methods: Observational comparative cross-sectional study for Six months in Ain Shams University Hospitals, Cairo, Egypt after approval of the research ethical committee on Normal people without any history of ocular pathology except for refractive errors.
Results: In our study, we compared CCT measurements of both devices among 70 eyes of 35 normal subjects with a nonsignificant past ocular history. The mean age of the study subjects was 29.49 ± 7.98 years (range 20-48 years). All subjects attended Ophthalmology Department at Ain Shams University Hospitals and all measurements were taken by the same examiner at the same time of the day. Regarding age, sex, and refraction, there was no statistically significant difference between CCT measurements by each individual device. However, there was a statistically significant difference between CCT measurements when compared by both devices. The difference between the mean ± SD of both devices was 7.17 ± 0.98 µm.
Conclusion: There is a statistically significant difference in central corneal thickness measurement between Nidek AL-Scan and Nidek Specular Microscope CEM-530. Several studies are needed to further correlate CCT with other parameters measured by both devices, namely anterior chamber depth and axial length.