Active clinical trials for "Cataract"

The principal objective of the study is to determine the visual acuity at far, intermediate and near distances tested with optotypes at different distances from the eyes and tested with defocus addition lenses of patients implanted bilaterally with the POD 26P AY FineVision. Secondary objective will be to test the glare and contrast sensitivity.

The management of childhood glaucoma (CG), childhood cataract (CC) and other birth defects affecting the eyes requires frequent hospital attendances and often multiple surgical and medical interventions, and are often associated with poor vision. Chronic medical conditions and vision impairment can affect quality of life (QoL). The QoL of children with the above conditions has not previously been evaluated.

The purpose of this study is to assess the axial IOL rotation after surgery with an MC 6125 AS IOL. At the end of surgery the orientation of the IOL is documented with a short video clip via the operating microscope unit. Follow-up examinations are performed 1 hour, 1 week and 6 months after surgery. Rotational stability of the IOL is assessed using retroillumination images with a method to avoid bias from cyclorotation or head tilt.

Congenital cataracts (CC) are the leading cause of childhood visual disabilities and treatable childhood blindness worldwide1. CC patients have a wide range of presentations of lens opacities and are generally categorized into several groups based on the etiologies, anatomical positions, or shapes of lens opacities. Cataractous eyes of CC patients are also frequently complicated with other anterior segment abnormalities due to their close anatomical relationships and similar developmental origins. Lens opacities in different positions may be related to specific anterior segment abnormalities; for example, anterior polar cataracts are associated with greater corneal astigmatism (CA). However, no studies have systematically related the position of lens opacities to specific anterior segment abnormities, mainly due to the small number of CC patients, a lack of proper equipment, and a lack of awareness of these important relationships.

This is a retrospective study to determine if rates of osmolarity and dry eye disease symptoms increase following cataract surgery.

The purpose of this study is to evaluate the visual outcomes, amount of inflammation, endothelial cell loss, and the efficiency of a torsional handpiece compared to a conventional handpiece during surgery to remove your cataracts.

This study will investigate whether people who donate granulocytes (a type of white blood cell) by leukapheresis are at increased risk of developing cataracts (changes in the lens of the eye that can impair vision). Apheresis is a method of collecting large numbers of white blood cells. The procedure is similar to donating whole blood, but the collected blood is circulated through a cell separator machine, the white cells are extracted, and the rest of the blood is returned to the donor. Before the procedure, donors are given a steroid called dexamethasone. This drug temporarily increases the number of granulocytes circulating in the blood, thus allowing twice as many of these cells to be collected. Recently, one blood collection center reported greater numbers of cataracts in a small number of granulocyte donors who had received repeated doses of steroids for granulocyte mobilization. The donors were unaware that they had the cataracts, which were small and did not affect their vision. Although people who take high doses of steroids over a long period time are known to have an increased risk of cataracts, steroids given infrequently (and in the doses used for granulocyte donation) have not been associated with cataracts. This study will examine the eyes of granulocyte donors and of platelet donors. Platelets-blood components necessary for clotting-are also collected by pheresis, but donors are not given steroids before the procedure. The examination findings will be compared to see if there is a difference in the risk of cataract formation in the two groups. People 18 years of age and older who have donated granulocytes or platelets at the NIH Department of Transfusion Medicine four times or more since 1984 may be eligible for this study. Participants will undergo the following procedures: Detailed medical history, including allergies, corticosteroid use, diabetes mellitus, and asthma Detailed eye history, including cataracts, glaucoma, other eye diseases and infections, eye trauma, and corrective lenses Detailed history of sun exposure Eye examination, including measurement of visual acuity (eye chart test) and eye pressure, examination of the lens and retina. Photographs of the eye using a special camera

Glaucoma is a very frequent disease in Brittany. In glaucoma the retinal ganglion cells and their axons slowly die with visible changes at the optic nerve head (cupping). Without early diagnosis and effective treatment or with delayed treatment decrease of visual acuity or blindness become. In secondary pseudoexfoliation glaucoma grayish-white deposits of abnormal proteins are found on all surfaces of eye irrigated by the aqueous humor. The deposits of PEX material inside the trabecular meshwork decrease aqueous humour outflow and the intraocular pression raise. The exfoliation material is found on the surface of the lens capsule with frequent developement of nuclear cataract . After cataract surgery the intra ocular pressure (IOP) decrease. Some recent study have found decreasing ocular volume variation associated to IOP fluctuation in night after cataract surgery in normal pressure glaucoma patients. In our study we want see if it's the same thing in pseudoexfoliation glaucoma patients.

The objective of this study is to evaluate the uncorrected binocular distance, intermediate, and near visual acuities, and assess patient's spectacle independence and satisfaction in individuals undergoing bilateral cataract extraction that have received two different arms of near add design IOLs of the same diffractive multifocal model.

The study intends to measure the evolution over time of the cognitive capacity of patients undergoing cataract surgery in relation to the opaque lens removal surgery (cataract) in a population considered to be at risk of neurocognitive degeneration. Secondary objectives: • Estimate the incidence of postoperative cognitive dysfunctions and any episodes of perioperative delirium with the aim of demonstrating the safety of cataract surgery in the elderly patient in terms of cognitive functions and impact on the psychological state. In the context of the study a risk sub-population analysis will be carried out, evaluating the trend over time of the "endothelial cells count" parameter The elderly population remains, due to the aging of the cornea, a population "at risk" for significant alterations from the clinical point of view. During the study the endothelial cells count will be monitored, in order to be able to evaluate the safety of the cataract surgery and to be able to correctly correlate a possible deterioration in the visual acuity of patients with corneal decompensation. To evaluate the progress of the endothelial cells count in the elderly patient during the pre-intervention and post-intervention period. Since the low values of cellular media in endothelial microscopy are an element that increases the risk of complications during cataract surgery, the study wants to assess how waiting times between filter visits and cataract surgery can cause an elderly patient worsening of this parameter even in a few months. The trend of the same parameter will be monitored even after the intervention since in case of decrease, the low endothelial count could cause an alteration of visual acuity and therefore a minor improvement in cognitive performance. The research will be set as a longitudinal observational study where will be compared in each patient the parameters analyzed in the 6 months prior to cataract surgery and in the 3 months following the operation itself. Patients will be enrolled during the first cataract filter visit, will be submitted to simple questions and their clinical data will be collected. Subsequently, before and after three months of surgery repeated cognitive testing and the control normally performed instrumental tests during follow-up. A clinical follow-up will be provided, during normal follow-up visits at 20 days and 6 months after the patient's surgery: the following information will be collected during these visits BCVA (visual acuity) endothelial cells microscopy OCT macula and optic nerve Catquest 9SF; Barthel Index; Six Item Cognitive Test Confusion Assessment Method (CAM): this exam will be performed within 24 hours of post-surgery and 20 days after surgery. It is important to underline that the cognitive tests proposed to patients consist of simple questions that do not depend on the visual ability of the subject.