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Astigmatism Bilateral clinical trials

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NCT ID: NCT05629078 Not yet recruiting - Clinical trials for Astigmatism Bilateral

Vision and Balance Changes After Bilateral Implantation of Toric IOLs

Start date: December 1, 2022
Phase: N/A
Study type: Interventional

Cataracts are the major cause of blindness in the world. Cataract surgery, being the most performed surgery in the world today, provide correction by extracting the natural lens from its capsular bag and replaced by an artificial intraocular lens (IOL) implantation. In the UK, almost all patients undergoing cataract surgery by the NHS are given monofocal intraocular lenses (IOLs) which do not correct corneal astigmatic error. It is estimated that around 20% of the population has over 1.50DC of corneal astigmatism. Uncorrected astigmatism not only increase spectacle dependency and reduce quality of life post surgically, but it also adversely affects the overall economic costs. Specialised toric IOLs offer the opportunity to correct pre-existing corneal astigmatism. Previous work has shown a link between reduced vision and balance or mobility. Full correction of refractive error may have greater impact on lifestyle than previously thought.

NCT ID: NCT05580575 Active, not recruiting - Clinical trials for Astigmatism Bilateral

Evaluation of Wear Experience With Daily Disposable and Monthly Replacement Toric Contact Lenses

Start date: November 1, 2022
Phase: N/A
Study type: Interventional

Comparison of wear experience with daily disposable and monthly replacement soft contact lenses in contact lens wearers who have astigmatism.

NCT ID: NCT04728451 Recruiting - Clinical trials for Astigmatism Bilateral

Spectacle Prescribing in Early Childhood

SPEC
Start date: March 26, 2021
Phase: N/A
Study type: Interventional

The purpose of this study is to compare developmental outcome for young children (12 to 35 months of age) with astigmatism meeting American Academy of Ophthalmology spectacle prescribing guidelines and who are prescribed and provided spectacles for either Full-Time wear (encouraged and reinforced) or Ad Lib wear (wear dependent on child acceptance).

NCT ID: NCT04297969 Completed - Clinical trials for Astigmatism Bilateral

Hyperopia Detection GCK With Glow Fixation

Start date: October 14, 2019
Phase:
Study type: Observational

"GoCheck Kids" has added to its iPhone 7+ smart phone with flash concentrator a non-accommodating glow box fixation target. In pediatric eye patients, the "GCK" with glow box is compared to cycloplegic refraction as well as School Bus Accommodation-relaxing skiascopy, "2WIN" photoscreener and "Retinomax."

NCT ID: NCT03779503 Completed - Clinical trials for Astigmatism Bilateral

Comparison of Two Daily Disposable Soft Contact Lenses

Start date: February 8, 2019
Phase: N/A
Study type: Interventional

The aim of this study was to investigate the short-term clinical performance and subjective acceptance of the two study lenses.

NCT ID: NCT03684928 Completed - Clinical trials for Astigmatism Bilateral

A Bilateral Dispensing Comparison of Comfilcon A Over Senofilcon C Contact Lenses

Start date: July 23, 2018
Phase: N/A
Study type: Interventional

The aim of this study is to evaluate the subjective acceptance of Comfilcon A contact lenses when worn on a daily wear modality over one month.

NCT ID: NCT03082599 Completed - Clinical trials for Astigmatism Bilateral

Symfony Toric Intraocular Lens Visual Outcomes

Start date: February 17, 2017
Phase: N/A
Study type: Interventional

In July 2016, the FDA approved an extended depth of focus (EDOF) IOL (Tecnis Symfony, Abbott Medical Optics) helping to improve the sharpness of vision at near, intermediate and far distances reducing the need of glasses after cataract surgery. It is available in both a non-toric version and a toric version for patients with astigmatism. The difference between this lens and the multifocal (MIOL) counterpart is that the EDOF, similarly to a monofocal IOL, has one focal point (elongated in the EDOF) while the multifocals have 2 focal points; therefore, having less of a halo and glare problem. Pivotal trial results where Symfony was compared to a monofocal IOL showed similar uncorrected distance visual acuity (UCDVA), better intermediate (77% vs. 34% 20/25 uncorrected intermediate visual acuity - UCIVA) and near vision (Symfony patients were able to read two additional, progressively smaller lines compared to the monofocal IOL).A One potential disadvantage of the EDOF IOL compared to a MIOL is the visual performance at near.B One option to deal with this potential shortcoming is to set the non-dominant eye for a small residual myopic error (-0.50 D)C what is referred to as nano-vision or mini mono-vision.