Clinical trials: Refractive Surgery
Myopia, Astigmatism
Wavefront-guided LASIK Surgery Compared to Ray Tracing-Guided LASIK Surgery
We are enrolling participants aged 22 and older to have LASIK surgery in both eyes. We will perform wavefront-guided LASIK in one eye and ray tracing-guided LASIK in the fellow eye of each participant.
- Trial name
- NCT07078799
- Testing
- LASIK
- Where
- United States
- Volunteers
- 70 people, healthy volunteers welcome
- Sponsor
- Stanford University
Myopia, Keratoconus
Assessment of Corneal Biomechanical Properties Using Corvis ST and ECD Following LASIK, PRK, CXL, Veriflex IOL and Implantable Collamer Lens
To evaluate corneal biomechanical changes using the Corvis ST and ECD in patients who have under-gone LASIK, PRK, corneal cross-linking (CXL), Veriflex IOL and ICL.
- Conditions
- Myopia, Keratoconus, Refractive Surgery
- Trial name
- NCT06818461
- Testing
- Corvis St Before and after lasik, PRK, CXL, Veriflex IOL and ICL
- Where
- Egypt
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- Beni-Suef University
Visual Impairment, Hearing Loss
Survey of Sensory Impairment Indicators Among Adults Aged 65 Years and Older in Xinxing County
This cross-sectional population-based survey will be conducted among residents aged 65 years and older in Xinxing County, Yunfu, Guangdong Province, China.
- Conditions
- Visual Impairment, Hearing Loss, Dual Sensory Impairment, Cataract
- Trial name
- NCT07694505
- Where
- China
- Volunteers
- 2,854 people, healthy volunteers welcome
- Sponsor
- Zhongshan Ophthalmic Center, Sun Yat-sen University
Myopia
Does Pupil Size Matters in Refractive Surgery?
To determine the influence of pupil size in refractive surgery. If any influence exist.
- Trial name
- NCT01678729
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Ziv Hospital
Corneal Astigmatism
Toric IOL vs Non-toric IOL With LRI for Corneal Astigmatism
The purpose of the study is to compare the astigmatism reducing effect of a toric intraocular lens (IOL) (model MX60T - Bausch \& Lomb) with that of limbal relaxing incisional surgery combined with a non toric IOL (model MX60 …
- Trial name
- NCT03633851
- Testing
- Toric intraocular MX60T lens, Standard MX60 plus corneal incisions
- Where
- United Kingdom
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Ashford and St. Peter's Hospitals NHS Trust
Refractive Errors
Clinical and Refractive Outcomes After Contoura® Refractive Surgery Planned Using Phorcides Surgery Planning Software
The objective of the current study is to prospectively evaluate 3-month clinical outcomes from LASIK performed using the Phorcides surgical planning software with Contoura topography-guided ablation in both eyes of subjects with…
- Trial name
- NCT04495829
- Testing
- Phorcides Analytical Engine
- Where
- 5 sites in United States
- Volunteers
- 70 people, healthy volunteers welcome
- Sponsor
- American Corneal Consultants
Astigamtism
Prospective Comparative Study of Refractive Outcome of STAAR and Alcon Toric Intraocular Lenses
Several methods have been developed to address and reduce preexisting astigmatism. The refractive results associated with the use of toric IOLs are likely to be more predictable.
- Trial name
- NCT01121861
- Testing
- Phacoemulsification with implantation of toric IOL
- Where
- Singapore
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- Singapore National Eye Centre
Refractive Errors, Refractive Surgery
Femto-flap Versus SBK Flap,Predictability and Variability
Laser Insitu keratomileusis (LASIK) has become the most popular procedure for refractive error correction. Lasik flap creation is the first and critical step during LASIK surgery because of its consensual effect on a residual…
- Trial name
- NCT04684888
- Testing
- Visumax Femto-flap, Sub Bowman's keratomileusis (SBK)-flap
- Where
- Iraq
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- Suzan A Rattan
Cataract Extraction
Microincision Versus Smallincision Combined Surgery
The purpose of this study is to compare refractive outcomes after two different types of combined cataract surgery, namely microinscision cataract surgery and smallincision cataract surgery, and sutureless 23-gauge vitrectomy in…
- Trial name
- NCT01198483
- Testing
- Combined Micro- Surgery, Combined Small-Surgery
- Where
- Austria
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- The Ludwig Boltzmann Institute of Retinology and Biomicroscopic Laser Surgery
Myopia, Astigmatism
Contralateral Study of Topography Guided LASIK Versus Small Incision Lenticule Extraction
This study evaluates differences in postoperative visual outcomes between patients receiving Topography-Guided LASIK in one eye and Small Incision Lenticule Extraction in the other eye.
- Trial name
- NCT05611294
- Testing
- Topography Guided LASIK Surgery, Small Incision Lenticule Extraction Surgery
- Where
- United States
- Volunteers
- 42 people, healthy volunteers welcome
- Sponsor
- Hoopes Vision
Cataract
Rotational Stability of Acrysof IQ Vivity Extended Vision Toric IOL and Refractive Visual Outcome.
The purpose of this research is to assess the rotational stability of the AcrySof IQ Vivity Extended Vision Toric IOL and Refractive Visual outcome.
- Trial name
- NCT05119127
- Testing
- Alcon Vivity toric intra ocular lens
- Where
- United States
- Volunteers
- 35 people, healthy volunteers welcome
- Sponsor
- Kevin Barber
Refractive Surgery
CONTOURA vs WFO Ablation PRK & LASIK
This is a prospective randomized contralateral double-masked study. Each patient will be randomized as to which eye undergoes wave-front optimized (WFO) vs.
- Trial name
- NCT05037370
- Testing
- Wave-Front Optimized (WFO) ablation vs Topography-guided (TG) ablation
- Where
- United States
- Volunteers
- 400 people, healthy volunteers welcome
- Sponsor
- 59th Medical Wing
Cataract, Cataract Senile
Impact of a Novel Extended Depth of Focus Intraocular Lens on Visual and Lifestyle Enhancement
The introduction of presbyopia-correcting intraocular lenses (PC-IOLs) has provided cataract and refractive surgeons the ability to provide patients with a wider range of visual success and spectacle independence post-cataract…
- Conditions
- Cataract, Cataract Senile, Presbyopia
- Trial name
- NCT04570579
- Testing
- Vivity Extended Depth of Focus Intraocular Lens
- Where
- United States
- Volunteers
- 46 people, healthy volunteers welcome
- Sponsor
- Alanna Nattis, DO
Refractive Errors, Myopic Astigmatism
Evaluation of Different Lenticule Diameters in Myopic Astigmatism Correction With SMILE Procedures
Small incision lenticule extraction (SMILE) is a refractive intrastromal procedure for myopia and myopic astigmatism correction.
- Trial name
- NCT06062004
- Testing
- Small Incision Lenticule Extraction (SMILE)
- Where
- Egypt
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- Al Watany Eye Hospital
Myopia, High Myopia
Clinical Results of Small Incision Lenticule Extraction (SMILE) for the Correction of High Myopia
Small Incision Lenticule Extraction (SMILE) was introduced in 2011 using the VISUMAX femtosecond laser (Carl Zeiss Meditec, Jena, Germany). It is designed for correction of myopia and myopic astigmatism.
- Trial name
- NCT04110067
- Testing
- Small Incision Lenticule Extraction (SMILE) with Visumax (Carl Zeiss Meditec, Jena)
- Where
- Germany
- Volunteers
- 5,000 people, healthy volunteers welcome
- Sponsor
- Suphi Taneri
Pregnancy
The Influence of Hormonal Changes During Pregnancy on Corneal Biomechanics in Humans
The intraocular pressure in the human bulbus requires that the "wall" of the eye shows a certain (bio)mechanical strength. The human cornea represents the anterior portion of this wall.
- Trial name
- NCT01629264
- Testing
- Ocular Response Analyzer, Scheimpflug measurement, Blood sample
- Where
- Switzerland
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- University Hospital, Geneva
Myopia
Long-term Effects of Laser Refractive Surgery
This study will determine if there are short- and long-term postoperative differences in visual and corneal outcomes between different laser refractive surgical procedures.
- Trial name
- NCT00350246
- Testing
- Laser Refractive Surgery
- Where
- United States
- Volunteers
- 62 people, healthy volunteers welcome
- Sponsor
- Mayo Clinic
Cataract, Corneal Disease
Influence of Pupillary Behavior During Eye Surgery on Morphological and Functional Outcome
Pupillary movement during eye surgery can be a challenge for eye surgeons. Despite the risk of intraocular lens damage and malpositioning due to mechanical manipulation1, iris manipulation may lead to a significant elevation of…
- Conditions
- Cataract, Corneal Disease, Vitreous Disorder
- Trial name
- NCT06160960
- Testing
- OCT Scan, Video of pupil movement, video of toric lens
- Where
- Austria
- Volunteers
- 500 people, healthy volunteers welcome
- Sponsor
- Klinikum Klagenfurt am Wörthersee
Cataract Extraction, Phacoemulsification
A Study Comparing Two Monofocal, Aspheric, Hydrophobic Acrylic Intraocular Lenses: the Alcon CLAREON® and the Abbott Medical Optics PCB00
This is a bilateral randomised controlled study to compare visual performance, refractive outcome, forward light scatter, patient satisfaction and objective measurement of glistenings following insertion of two monofocal…
- Conditions
- Cataract Extraction, Phacoemulsification, Glistenings, Intraocular Lens Implant
- Trial name
- NCT03364972
- Testing
- Cataract surgery
- Where
- United Kingdom
- Volunteers
- 145 people, healthy volunteers welcome
- Sponsor
- Guy's and St Thomas' NHS Foundation Trust
Image, Body
Whole Eye Optical Coherence Tomography (OCT) to Improve Refractive Surgery and Eye Care
The overall objective is to develop the hardware systems and software algorithms necessary to make accurate measurements of the whole eye with optical coherence tomography (OCT).
- Trial name
- NCT03219567
- Testing
- Optical Coherence Tomography (OCT), Magnetic resonance imaging (MRI)
- Where
- United States
- Volunteers
- 82 people, healthy volunteers welcome
- Sponsor
- Duke University