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NCT07176429
Cataract surgery involves the removal of a cloudy natural lens, followed by the implantation of an artificial lens. The choice of lens implant helps determine what the vision will be like after surgery. "Monofocal" lens implants are not designed to give both distance and close-up vision at the same time. We wish to study the amount of reading ability that a lens implant corrected for distance vision will provide. Eligible study participants include those who have had cataract surgery with implantation of either the Light Adjustable Lens® (LAL), the Light Adjustable Lens Plus® (LAL+) or the Bausch \& Lomb Akreos® AO60 lens implant. We anticipate enrolling up to 100 subjects in this study. These lens implants are designed to achieve excellent distance vision, inasmuch as the lens implant target is achieved. The lens implant target of excellent, unaided distance vision is more likely to be achieved when the chosen power of the lens implant matches the eye's curvature and length. Before cataract surgery, the eye is measured by a machine, and the information is used to calculate which lens power is predicted to best match the eye. In the case of the LAL, a light delivery device is used after surgery to fine-tune the power of the lens implant and achieve sharper unaided vision. Although both of these lens implants are technically "monofocal" lenses and work well for distance vision, they differ in ways that affect near vision. "Pseudoaccommodation" is the term that refers to the ability of an eye with a lens implant to see up close without glasses. The optical qualities of the Light Adjustable Lens generally allow eyes implanted with this lens to see objects at an intermediate or close-up range without glasses. The amount of pseudoaccommodation or close-up ability in these eyes differs from person to person. The purpose of this study is to determine the average amount of reading ability in eyes implanted with the Light Adjustable Lens® and compare it to the amount measured with the Bausch \& Lomb AO60 lens.
NCT06704503
Accommodation is defined as a dynamic change in the overall refractive power of the eye during near fixation. Despite extensive investigations, the exact nature of human accommodation remains controversial. And recent alternative theories question the original concept of accommodation.Different experts have put forward different hypotheses. The age-related changes that underlie presbyopia are also not fully understood.Because of these unanswered questions, the topic of regulation and presbyopia remains a focus of research.
NCT04700111
The objective of the study is to measure the difference in the lag of accommodation between DOT spectacle lenses and control spectacles.
NCT06565091
The purpose of this clinical investigation is to evaluate the clinical utility of a multifunctional measuring device for Ophtalmology. The results of this clinical investigation will be used to refine and validate the device design. 378 participants total will be included in the trial, each having only one visit at the investigation center.
NCT06286410
Anisometropic amblyopia is when one eye has a much stronger glasses prescription than the other, causing poor vision in one eye, even with glasses, because the brain favours the better-seeing eye. With standard care treatment (glasses plus either patching or atropine drops given to the better seeing eye), 35% of children with anisometropic amblyopia do not have any significant visual improvements, and will have reduced vision in one eye for life. There is no consensus for the reasons why some children do not respond as well as others. Recent research using the Plusoptix PowerRefractor (PR3), which quickly measures eye focusing (accommodation), suggested that in children with anisometropic amblyopia, the focusing of the amblyopic eye might influence treatment success. However, such measurements weren't previously common due to equipment limitations in clinics. The investigators aim to use the non-invasive PR3 to assess accommodation in hypermetropic anisometropic amblyopia, at the University of Sheffield. This will be a two-phase study of children aged 4-10 years who have hypermetropic anisometropia. The investigators will recruit participants attending the Ophthalmology Department at Sheffield Children's NHS Foundation Trust (SCH). The investigators will take repeated measurements of accommodation at points during standard care treatment (phase 1) and conduct a pilot intervention study (phase 2) to determine whether adjusting glasses prescriptions based on accommodation responses with amblyopia treatment can improve vision in the weaker eye. The goal is to gather evidence to inform a future larger multicentre RCT to improve the visual outcomes for anisometropic amblyopic children in the future.
NCT03906279
There is a great need for precise and repeatable measurements of the choroidal thickness. Including the diurnal physiological changes, accommodation and refractive error impact on those measurements.
NCT03957408
An investigational study in the control of the user's accommodative state via visual stimuli.
NCT04763694
The purpose of this study is to report the changes in accommodation, aberrations, and myopia in patients wearing multifocal soft contact lens for various durations. The study objectives are to: 1. Determine the effects of wearing multifocal soft contact lens on accommodation and aberrations over a 12-month period. 2. Determine the effect of wearing multifocal soft contact lens on myopia over a 12-month period.
NCT01329848
This project will develop clinically useful, objective measurements of accommodative insufficiency and fatigue using continuous autorefraction recordings. The development of these procedures will help vision care professionals diagnose and treat accommodative anomalies.
NCT01153789
The eye movements of vergence allow binocular vision whatever the viewing distance or the body movements are and the perception of depth. Vergence dysfunction can lead to erroneous visual sensation of movements. In our daily life using screens (computer, game boys..) is increasing and this approach heavily the ocular vergence and can lead to symptoms if oculomotor and accommodative systems are dysfunctioning (Ped. Neurology 2000). Not knowing this pathology lead to inappropriate and expensive prescription CT scan or NMR. To evaluate the vergence performances just evaluation in static condition is currently available in ophthalmology departments. The CNRS laboratory (IRIS, FRE 3154) adapted a technic of eye movement recording to study ocular vergence in dynamic condition.
NCT01226134
Pathogenesis of functional dyspepsia is poorly understood. Gastrointestinal motor abnormalities, Helicobacter pylori infection, impaired gastric accommodation to a meal, hypersensitivity of the afferent nerves of the gut, psychological disturbances and central nervous system dysfunction have been proposed. Pharmacological treatments for patients with functional dyspepsia remain unsatisfactory. Only small benefits relative to placebo have been found with histamine H2 receptor antagonists, proton pump inhibitor and Helicobacter pylori eradication. Itopride is a dopamine antagonist with acetylcholinesterase inhibitory actions. This agent is currently indicated for patients with various upper GI symptoms. This study is aimed to evaluate the effect of Itopride on gastric emptying(by 13-C Octanoic acid breath Test), accommodation (by Gastric Scintigraphy SPECT and slow nutrient drinking test)and symptoms in FD patients
NCT00877201
The purpose of this study is to determine the antioxidant supplementation effect on accommodation among visual display terminal (VDT) users.