View clinical trials related to Cataract.
Filter by:The Web-based Barret True K formula with no history formula has been proven to be a good choice for cataract patients after RK in several studies. The American society of cataract and refractive surgeons provides several IOL formulas for cataract patients who have undergone previous corneal refractive surgery. In cases where only IOL-Master data are available, Holladay 1 (Double-K) [Holladay 1 (D-K)] can be used for IOL power calculation in cataract patients with a history of RK. The traditional Haigis formula has also been shown to be effective for cataract patients after RK. To compare the accuracy of four intraocular lens (IOL) power calculation formulas in cataract patients after RK. They are Barrett True-K formula, Holladay 1(D-K) formula, Haigis formula, and MM formula.
Assessment and differences in the centration, tilt and wobble of two secondary IOLs without capsular support.
Comparison of the clinical performance of two enhanced monofocal IOLs with similar design.
A Study to Evaluate the enVista® Aspire (EA) intraocular lens in Subjects Undergoing Cataract Extraction
This research study is evaluating the safety and efficacy (performance) of the Bausch + Lomb enVista Beyond Hydrophobic Acrylic Extended Depth of Focus Intraocular Lens (IOL) in subjects who receive this IOL in both eyes.
The goal of this clinical trial is to compare the performance of 2 intraocular lenses (IOLs): ARTIS SYMBIOSE (study lenses) vs PANOPTIX (comparator) through binocular Distance Corrected Intermediate Visual Acuity (DCIVA) assessed at 80 cm in photopic conditions at minimum 1-month post-operative by a blinded evaluator. This main objective will be to show superiority of the ARTIS SYMBIOSE system on the primary endpoint. The patient population to be included is patient suffering from cataract who requires cataract surgery procedure that meet the inclusion and non-inclusion criteria and provide written informed consent. Participants will attend a total of 5 study visits: 1 preoperative visit, 1 surgery visit and 3 postoperative visits.
To investigate the impact of high vs low Intraocular Pressure (IOP) on the intraoperative experience for the patient and surgeon. Operating at a more physiologic IOP using Active Sentry hand piece during cataract surgery will result in significantly less discomfort/pain as assessed by the decreased need for rescue medication
The goal of this clinical trial is to compare the performance of 3 intraocular lenses (IOLs): FineVision (comparator), ARTIS SYMBIOSE (study lenses), and Tecnis Synergy (comparator) through binocular distance-corrected defocus curve. This main objective will be to show superiority of the ARTIS SYMBIOSE system through binocular distance-corrected defocus curve. The patient population to be included is patient suffering from cataract who requires cataract surgery procedure that meet the inclusion and non-inclusion criteria and provide written informed consent. Participants will attend a total of 5 study visits: 1 preoperative visit, 1 surgery visit and 3 postoperative visits.
During cataract surgery an artificial intraocular lens (IOL) is implanted in the eye to replace the lens and to correct the refraction for distance vision. Misalignment of IOLs can cause severe loss of visual quality. Different types of misalignment are known. Tilt, one type of IOL misalignment is thought to play a negative role for the optical performance in eyes with IOL designs, especially, if they have aspheric, toric, or multifocal optics. Various methods to measure IOL misalignments have been described. Studies assessing the IOL position have used subjective grading methods at the slit lamp examination or a Scheimpflug camera to assess IOL decentration and tilt. The subjective grading at the slitlamp may display considerable variability between examiners. This method is more qualitative than quantitative and does not allow fine resolution when reporting IOL tilt. The fact that the patient has no standardized target to focus on makes the method even less reliable. Scanning methods such as Scheimpflug photos require a very well dilated pupil exceeding 6mm to assess the IOL position. Additionally, it can be difficult to identify the anatomical structures of the eye that need to be used as points of reference. Scheimpflug camera images have been used for assessing IOL tilt previously, but erroneous results, often due to corneal magnification, have diminished their widespread use. Another possibility to assess tilt is the use of Purkinje reflexes. The light reflections of Purkinje images at ocular surfaces to evaluate ocular alignment have recently been utilized. Since light is reflected at all interfaces of media with a difference in refractive index, these reflections, called Purkinje images, can be used to assess tilt and decentration of IOLs. Two different clinically applicable Purkinjemeter system provide the measurement of IOL decentration and tilt. The main problem with Purkinje meters is accessibility, as there are only a few prototypes available worldwide. The most recently developed method for tilt quantification is the use of optical coherence tomography. This method has several advantages compared to the previous methods: OCT based devices are available in most clinics, the resolution of modern OCT devices is high, and the measurements are reproducible. Aim of this study is to measure tilt with two modern OCT based devices and one Scheimpflug camera and to predict the post-operative tilt using partial least squares regression. This method was developed by Wold and introduced to ophthalmology previously.
This study is designed to explore dry eye disease (DED) pattern: ocular surface, corneal morphological changes, patients' subjective assessment of DED and their correlations with ocular surface inflammation, pain biomarkers after cataract surgery according to ocular surface lubrication with artificial tears during long-term follow-up.