Active clinical trials for "Cataract"

To evaluate the effect of bilateral cataract surgery with intraocular lens implantation on the daily activity levels of elderly patients.

Cataract is currently the leading cause of visual impairment worldwide with age being the most common cause of lenticular opacification. As cataract surgery is the most commonly performed elective surgery worldwide, forecasts of an increasing number of elderly individuals make it clear that efficient and evidence based models for managing cataract in the future need to be implemented to manage the broadening gap between intervention and available resources. Bilateral cataract is currently treated using same day separate surgical procedures (immediate sequential bilateral cataract surgery (ISBCS) or on separate days (delayed sequential bilateral cataract surgery (DSBCS). Whether one approach is more ideal than the other is an ongoing debate. There is, however, a clear advantage of same day surgery on resource management. The primary purpose of this clinical study is to measure the patient reported satisfaction regarding vision in a group of 300 participants following either same day or delayed bilateral cataract surgery.

To evaluate the clinical outcomes with an extended range of vision (ERV) IOL based on achromatic diffractive technology.

To evaluate the safety and surgical effectiveness of surgical blades (Aurosleek) made by Aurolab.

The study objective is to assess changes in corneal sensation and dry eye signs and symptoms following cataract extraction/femtosecond arcuate relaxing incisions. Our clinical hypothesis is to determine if a combination of cataract surgery and femtosecond arcuate relaxing incisions lead to a reduction in corneal sensation and the onset or worsening of dry eye signs and symptoms.

During cataract operations a capsulorhexis is being performed. This is done in order to enable the removal of lens material while keeping the capsule intact in order to put inside the lens capsule an artificial intra ocular lens. The capsulorhexis must be round and with regular edge and no tears. While performing a cataract surgery we use phako emulsification machine that sends an ultrasonic wave that creaks the lens nucleus and at the same time irrigates the anterior chamber of the eye and sucks the fluid and the lens material of the creaked lens. The round shape and the regularity of the capsulorhexis are a must in these surgeries since the lens capsule must stay intact and stable in order to enable the phacoemulsification and the implant of the artificial lens. Today capsulorhexis are done with a bent needle or with special forceps; the act of capsulorhexis is delicate, sometime un predicted and difficult to teach. The learning curve is relatively long and difficult. The proposed device enables a capsulorhexis which is round and has regular edges, done almost automatically and is predicted. The learning curve is short and easy. The capsulorhexis is done through the original operating wound with no need to widen it.

The Objective Visual Quality Analysis System (OQAS) is a new inspection technology used to objectively assess the visual quality of the human eye. The investigators use this advanced technology to evaluate and follow up cataract patients before and after surgery, and observe the incidence, severity, and treatment effects of postoperative complications such as postoperative complications, and analyze the severity and artificial The influence of lens type, postoperative time, systemic diseases and other factors on the effect of cataract surgery, in order to discover the key factors that affect the effect of cataract surgery and the management of complications, and provide a useful reference for improving the level of cataract prevention and treatment in China

The objective of this study is to evaluate the efficacy of Diquafosol 3% in the management of dry eyes before and after cataract surgery. Patients with pre-existing dry eyes and planned for cataract surgery will be started on Diquafosol eyedrops prior to surgery and treatment will be continued after cataract surgery. Eligible patients will undergo evaluation of dry eye at baseline and subsequently started on treatment with Diquafosol for the duration of 4 weeks before surgery. Further evaluations will be conducted on the day of surgery and at designated time points during and up to 12 weeks after surgery.

Patients with congenital cataract operated at St. Erik Eye Hospital are given the topical steroid dexamethasone (Isopto-Maxidex) according to a set treatment plan. They are provided a contact lens made of the polymer Filcon 4A that is frequently replaced due to the results of previous in vitro studies that have shown accumulation of preservatives in the hydrogel contact lens matrix which could question their use in combination with ophthalmic solutions. We conducted a pilot study that indicate that the results in vivo are different from the results in vitro and we suspect that insignificant amounts of dexamethasone and benzalkonium chloride are taken up by the lenses due to tear drainage. Contact lenses from 30 patients at St. Erik Hospital that have undergone surgery for congenital cataract and are treated with eye drops containing dexamethasone and benzalkonium chloride will be collected and analyzed. Ultraviolet-Visible spectrophotometer (UV-vis) and Laser desorption ionization-mass spectrometry (LDI-MS) will be used to study uptake and release of dexamethasone and benzalkonium chloride. Scanning electron microscopy (SEM) will be used to study surface morphology. Thirty Contact lenses from a control group without topical treatment will also be analyzed. Data will consist of contact lens material, wearing time, pharmaceutical agents, contact lens solution when applicable, diagnosis and possible co-morbidity.

Mydriatic eye drops are routinely used before phacoemulsification but they are not free of drawbacks. Several alternatives were tried to overcome their limitations.