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Showing 1-20 of 141 trials
NCT07570602
Recent Android mobile device technology is available which allows user-measured refractive error and reading add power. This technology could be quite useful to the clinical and research community. The current study aims to evaluate the accuracy, repeatability, and reproducibility of one such technology by VisionApp, specifically with regard to refraction and presbyopia. VisionApp is an app which runs on a smartphone or other device which uses the distance between the user's face and the phone to determine refractive error, while the user looks at different targets (lines, letters, words, etc).
NCT07076160
This is a 6-visit, single-masked, multi-site, 2×3 crossover, randomized-controlled, dispensing clinical trial to evaluate visual acuity.
NCT07444658
This study will compare the performance of two daily disposable multifocal soft contact lenses.
NCT07512089
The goal of this clinical trial is to learn if laser blended vision (LBV) works better than traditional monovision LASIK to correct presbyopia in adults aged 40 to 55 years. Presbyopia is an age-related condition that makes it hard to see things up close. The study will also evaluate the safety of both procedures. The main questions it aims to answer are: Does LBV improve distance, intermediate, and near vision at the same time after surgery? Is LBV as safe as traditional monovision LASIK? Researchers will compare laser blended vision to traditional monovision LASIK to see if LBV provides better overall vision after surgery. Participants will: Be randomly assigned to receive either laser blended vision or traditional monovision LASIK Have standard eye examinations before surgery Undergo LASIK surgery using the assigned method Return for follow-up visits at 1 week, 1 month, 3 months, and 6 months after surgery Complete vision tests and questionnaires about visual quality and satisfaction
NCT04774237
Safety and Efficacy Study of BRIMOCHOL™ vs. BRIMOCHOL™ F vs. Carbachol Monotherapy Topical Ophthalmic Solutions in Subjects with Emmetropic Phakic and Pseudophakic Presbyopia
NCT07484191
The purpose of this study is to test new versions of Clareon Vivity Pro intraocular lenses (IOLs) by comparing them to currently marketed IOLs.
NCT06698731
The goal of this clinical trial is to learn if the contact lens we are testing will work to extend the range of clear focus at distance to provide an increase in clear vision at closer ranges without the additional need for bifocal lenses or reading correction. The clinical study will compare the use of the test lens for extended range of focus (far to near) to a standardized contact lens designed for distance vision (far) (ie. Walking, driving, etc., where closer-in vision is not anticipated to be helpful, particularly in a population of users in the age range of 45-70. We will also learn about the effectiveness of the lens to maintain good contrast in low illumination such as during evening and night-time periods. The main questions we aim to address in the study are: \*. Does the contact lens provide adequate vision at distances closer to the patient such as during reading or computer usage? \* Whether the contact lens in use introduces any visual disturbance or safety concern as compared to a currently designed lens for distance use? The study is designed to be conducted in the doctor's office: * Using electronic vision measuring equipment familiar to the user. * A total of two visits are necessary to complete he study * All patients will experience using the test lens as well as the control lens during the study * No contâct lenses will be given to the study patients to take home. * It is anticipated that the total amount of time of participation in the study will be approximately 3 hours of your time over two separate visits.
NCT03499821
This study will evaluate the clinical performance of a phakic intraocular lens (IOL) for the improvement of Uncorrected Near Visual Acuity (UCNVA) in subjects who require between +1.00 and +2.50 Reading Add.
NCT06542497
Safety and efficacy of POS in participants with presbyopia
NCT07218731
The purpose of the study is to assess participant experience when wearing multifocal contact lenses compared to spherical contact lenses with reading glasses.
NCT05656027
Phase 3 study to evaluate the safety and effectiveness of LNZ100 \& LNZ101 for the treatment of Presbyopia.
NCT05411341
Primary objective of this study is to evaluate and compare the measurements of two different optical biometrics systems in patients who will undergo cataract surgery or presbyopia surgery using intraocular lenses (IOL-PC).
NCT06460389
The primary objective of this study is to compare the postoperative visual acuity curves of patients that underwent one of the following surgical procedures: Insertion of an extended depth of focus intraocular lens with digital assistance and insertion of an extended depth of focus intraocular lens without digital assistance.
NCT07384182
This study aimed to assess the safety and efficacy of treating presbyopia in eyes implanted with a mono focal IOL using a low-energy femtosecond laser.
NCT06060041
The purpose of this study is to verify the post-market safety of the IC-8 Apthera IOL after the treatment of posterior capsular opacification (PCO), an expected complication related to IC-8 Apthera IOL implantation.
NCT07295119
Brief Summary of the Study The goal of this clinical study is to compare the quality of vision and patient satisfaction after cataract surgery using two different approaches to multifocal intraocular lenses (IOLs). These lenses replace the natural lens removed during surgery and are designed to allow clear vision at near, intermediate, and far distances, reducing or eliminating the need for glasses. The study aims to understand whether using two different lens models-Mini Well in the dominant eye and Mini Well Proxa in the non-dominant eye-produces different levels of visual quality, glare, halos, or overall satisfaction compared with implanting the same trifocal lens model (FineVision POD F) in both eyes. All lenses included in the study are approved medical devices already available on the market. Who can participate? Adults scheduled to undergo cataract surgery in both eyes at the Ophthalmology Unit of the Policlinico of Verona may be eligible. A total of 36 participants will take part. How does the study work? Participation is voluntary. After informed consent, participants are randomly assigned (like flipping a coin) to one of two groups: 1. Experimental group: Mini Well lens in the dominant eye and Mini Well Proxa lens in the other eye. 2. Comparison group: FineVision POD F lens in both eyes. Neither participants nor the clinical team conducting postoperative assessments will know which lenses were implanted (blinded study). Before surgery, participants undergo a standard ophthalmic evaluation, including visual acuity tests and measurements of eye structure. After surgery in each eye, follow-up visits take place at approximately 1-2 days, 14 days, 1 month, and 3 months. During these visits, clinicians assess visual performance, eye health, and any symptoms. At the 3-month visit, participants also complete a questionnaire on vision quality and satisfaction, and undergo a specific test to measure perception of halos. Participant responsibilities Participants are asked to attend all scheduled visits, follow medical instructions, use prescribed medications, and promptly report any symptoms or concerns. Potential benefits Participants may experience improved vision at all distances with reduced dependence on glasses. However, personal benefit cannot be guaranteed. The study is expected to help determine whether combining two different lens models provides better visual outcomes than using the same lens in both eyes. Risks and discomforts Risks are the same as those associated with standard cataract surgery and multifocal IOLs, including rare surgical complications and the possibility of visual disturbances such as glare or halos. These symptoms are common with multifocal lenses and often diminish over time, but in rare cases may require further intervention. All adverse events will be closely monitored. Alternatives Patients may choose standard cataract surgery with monofocal lenses, which usually provide clear vision at one distance and may still require glasses for intermediate or near vision. Declining participation will not affect the quality of care. Duration Each participant's involvement lasts about 4 months. Voluntary participation Participants may withdraw at any time without affecting their medical care. Confidentiality All personal and medical information will be handled confidentially and used only according to privacy regulations. Study results may be published anonymously in scientific reports.
NCT07232615
To evaluate the clinical outcomes and patient satisfaction of two commercially available trifocal toric intraocular lenses Primary Objective: To compare the distance-corrected intermediate visual acuity between the two trifocal toric intraocular lenses. Secondary Objectives: To assess and compare the safety of two trifocal toric intraocular lenses.
NCT04675151
The objectives of this study are: To evaluate the efficacy of Nyxol + Pilocarpine to improve DCNVA in subjects with presbyopia
NCT06469242
The purpose of this study is to evaluate the on-eye multifocal clinical performance of investigational LID233309 contact lenses and Oasys multifocal (MF) contact lenses in a daily wear dispensing trial.
NCT06745661
Visual fatigue, or asthenopia, occurs when visual demands exceed the capacity of the visual system, leading to various ocular discomfort and systemic symptoms. This condition can negatively affect personal activities, quality of life, and work productivity. Given the high prevalence of asthenopia in presbyopic population, finding effective methods to alleviate these symptoms is crucial. This study aims to evaluate the effects of repeated low-level red-light (RLRL) therapy on alleviating visual fatigue in individuals with presbyopia over a one-month period. Additionally, we will assess the potential benefits on accommodation function, cognition, and emotional effects of RLRL in this population. Interested individuals will be invited to the PolyU Optometry Clinic to undergo an eligibility examination. An estimated sample size of 66 participants will be recruited. The inclusion criteria specify individuals aged 40 years or older who self-report visual fatigue symptoms and require near correction in daily life. Exclusion criteria include those with ocular disease, systemic diseases, illiteracy, or an afterimage duration longer than 6 minutes. Eligible participants will be randomly assigned in a 1:1 ratio to either the intervention group or the control group. Each participant in the intervention group will be provided an RLRL therapy device, which they are required to use twice daily for 3 minutes per session, with a minimum interval of 4 hours between sessions, 7 days a week for one month. Participants in the control group will receive a sham device, following the same usage schedule. The study will evaluate changes in asthenopia questionnaire scores, CFF scores, other objective asthenopia indicators (i.e., eye movement, pupil parameters, and blink patterns), accommodation function, cognitive function, and emotional states at 2 weeks and 1 month compared to baseline. Statistical analysis will be conducted to explore evaluate within-subject changes over time and between-group differences in visual fatigue metrics, accommodation metrics, cognitive metrics, and emotional metrics. The findings will contribute to evaluating the effectiveness of RLRL therapy in reducing asthenopia and presbyopia symptoms, as well as its impact on cognitive function and emotional well-being.