• Sadia Humayun, Muqaddas Noor, Syed Abid Hussain Naqvi, Muhammad Shahid Tarar, Mazhar Ishaq, and Habiba Yasmeen.
• Refractive Surgical Department, Armed Forces Institute of Ophthalmology, Rawalpindi, Pakistan.
• J Coll Physicians Surg Pak. 2023 Aug 1; 33 (8): 890894890-894.

ObjectiveTo compare and correlate corneal keratometry (K), central corneal thickness (CCT), and anterior chamber depth (ACD) using a partial coherence interferometry device and a Scheimpflug camera system device in patients planned for cataract surgery.Study DesignComparative cross-sectional study. Place and Duration of the Study: Armed Forces Institute of Ophthalmology, from December 2021 to June 2022.MethodologyPatients planned for cataract surgery underwent measurement of central corneal thickness (CCT), anterior chamber depth (ACD), and keratometric values (K) by Wavelight OB 820 biometer and Allergo Oculyzer II, preoperatively. Correlation and inter-device agreement were assessed between two devices.ResultsThere were 115 patients with a mean age of 64.23 ± 9.26 years. All anterior segment parameters showed excellent agreement and high degree of correlation between the two optical devices. Correlation coefficient (r) for central corneal thickness was r = 0.958 (p<0.001) while correlation coefficient for anterior chamber depth was r = 0.965 (p<0.001), r = 0.966 (p<0.001) for flat K, and r = .0969 (p<0.001) for steep keratometry, respectively.ConclusionOphthalmic parameters assessed by both devices were comparable and are recommended to be used in the clinical practice of keratorefractive and cataract surgeries interchangeably.Key WordsACD, CCT, Keratometry, Cataract, OB 820 biometer, Oculyzer II.

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