The human (crystalline or phakic) lens is located in the capsular bag which is attached to zonules. Zonules are fibres, that hold the lens in place. In the course of life, an opacification on the lens occurs, which is called cataract. To replace the cloudy lens, cataract surgery is being performed and an artificial intraocular lens (IOL) is implanted in the eye, after the phakic lens is removed. Misalignment or tilting of IOLs can result in reduction of visual quality, therefore prediction of the position may be beneficial. Modern optical coherence tomography (OCT) devices already provide profound information about phakic lens tilt. Still there is little data on the values that influence the tilt of the crystalline lens. Before each cataract surgery, each eye is measured using biometry (IOL Master 700). However, a statement about the tilt cannot be made with this device. For this purpose, an anterior segment OCT is required (CASIA 2). In our study, preoperative biometry data are compared with anterior segment OCT data. A statistical analysis will then be performed to identify the biometric parameters that can predict phakic lens tilt.
This retrospective epidemiological study aims to quantify the physiological lens tilt of the phakic eye. Measurements were obtained using high-resolution swept-source optical coherence tomography. The influence of biometric measurements on tilt is analyzed.