Clinical trials: Corneal Astigmatism
Astigmatism
Nomogram for Astigmatism Correction of KLEx
The goal of this clinical trial is to learn if nomogram could promote treatment outcomes in astigmatism correction. The main question it aims to answer is: does the nomogram could promote treatment outcomes in astigmatism…
- Trial name
- NCT07605221
- Testing
- nomogram
- Where
- China
- Volunteers
- 100 people
- Sponsor
- Tianjin Eye Hospital
Cataract, Corneal Astigmatism
Post-market Study to Obtain Surgeon Feedback on Clinical Outcome in Eyes Implanted With TECNIS Toric II IOL
This is a multicenter, prospective, single-arm, open-label, clinical study of the commercially available TECNIS Toric II, Model ZCU IOL.
- Trial name
- NCT04210232
- Testing
- TECNIS® TORIC II Intraocular Lens (IOL)
- Where
- 12 sites in United States
- Volunteers
- 54 people
- Sponsor
- Johnson & Johnson Surgical Vision, Inc.
Cataract, Corneal Astigmatism
ClarVista HARMONI Toric Trial With Intraoperative Exchange
The purpose of this study was to demonstrate the safety and effectiveness of the HARMONI® Modular Intraocular Lens System with a toric optic in subjects with pre-existing corneal astigmatism in need of cataract surgery.
- Conditions
- Cataract, Corneal Astigmatism, Aphakia
- Trial name
- NCT03054649
- Testing
- HARMONI® Modular Intraocular Lens System, Intraoperative optic exchange
- Where
- 2 sites in Mexico, Philippines
- Volunteers
- 44 people
- Sponsor
- ClarVista Medical
Corneal Astigmatism
Contribution of Posterior Corneal Astigmatism to Total Corneal Astigmatism in a Sample of Egyptian Population
The magnitude of posterior corneal astigmatism was considered negligible due to the smaller difference in the refractive index between the cornea and the aqueous .
- Trial name
- NCT04393740
- Testing
- scheimpflug imaging using pentacam
- Where
- Egypt
- Volunteers
- 356 people, healthy volunteers welcome
- Sponsor
- Cairo University
Corneal Astigmatism
Limbal Relaxing Incisions Versus Paired 4 mm Clear Corneal Incisions on Steep Meridian During Phacoemulsification
The goal of this is prospective, computer based randomized clinical trial is to compare the efficacy of reduction of the pre-existing corneal astigmatism at the time of cataract surgery in patients admitted in sohag university…
- Trial name
- LRI-CCI (NCT05593263)
- Testing
- surgical correction of astigmatism with cataract
- Volunteers
- 120 people
- Sponsor
- Sohag University
Astigmatism
Evaluation Study on Corneal Lens for Vision Correction
The objective of this study is to evaluate the fitting and visual outcomes of Nexis Lens, made of silicone commonly used in the contact lens industry, on healthy eye with or without astigmatism.
- Trial name
- NCT02053688
- Testing
- Astigmatic Correction Lens (Nexis ACCL lenses), Toric Soft Contact Lenses
- Where
- 6 sites in United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- FORSIGHT Vision3
Keratoconus, Ectasia
Progressive Keratoconus or Ectasia Treatment Plan
Keratoconus and pellucid marginal degenerations are genetically based ocular conditions and post surgical ectasia is an iatrogenic condition.
- Trial name
- NCT01384773
- Testing
- Riboflavin Solution, UV-X Illumination System
- Where
- United States
- Volunteers
- healthy volunteers welcome
- Sponsor
- Stephen Trokel
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
Hyperopia
Safety and Effectiveness Study of the MEL 80 Excimer Laser Using LASIK in the Treatment of Hyperopia
The purpose of this study is to determine whether the MEL 80 Excimer Laser is effective in the treatment of hyperopia, when used as part of the Laser In Situ Keratomileusis (LASIK) procedure.
- Trial name
- NCT00762281
- Testing
- MEL 80 Hyperopic LASIK Treatment
- Where
- 6 sites in United States
- Volunteers
- 189 people, healthy volunteers welcome
- Sponsor
- Carl Zeiss Meditec, Inc.
Refractive Errors
Changes in Angle Kappa and Corneal Back Elevations After Laser in Situ Keratomileusis in Myopic Astigmatism
Refractive errors and corneal astigmatism are associated with changes in angle kappa and corneal back elevation at the thinnest point in Pentacam.
- Trial name
- NCT06166212
- Volunteers
- 50 people
- Sponsor
- Ain Shams University
Surrgical Induced Astigmatism
Surgically Induced Astigmatism of Temporal Versus Nasal Clear Corneal Phacoemulsification
To compare the short-term astigmatic outcomes of phacoemulsification cataract surgery and intraocular lens implantation using temporal versus nasal clear corneal incisions.
- Trial name
- NCT00521833
- Testing
- phacoemulsification and intraocular lens implantation
- Where
- Iran
- Volunteers
- 20 people
- Sponsor
- Shahid Beheshti University of Medical Sciences
Astigmatism of Both Eyes
Effect of Single Incision Versus Three Planned Incisions to Reduce Pre-operative Astigmatism After Phacoemulsification.
Cataract surgery by phacoemulsification is the most commonly performed procedure in Pakistan. Cataract surgery aims for visual rehabilitation and freedom from all kinds of eyewear.
- Trial name
- NCT05457348
- Testing
- Planned incisions during phacoemulsification
- Where
- Pakistan
- Volunteers
- 160 people
- Sponsor
- Suleman Roshan Medical College
Corneal Astigmatism, Cataract
Effectiveness, Stability and Influence Factors of Femtosecond Laser Assisted Cataract Surgery
What is this study about? This study looks at whether a laser procedure called femtosecond laser-assisted arcuate keratotomy (FSAK) helps people with both cataracts and mild astigmatism see more clearly after cataract surgery.
- Trial name
- NCT07081919
- Testing
- femtosecond laser-assisted arcuate keratotomy (FSAK) combined with standard cataract surgery
- Where
- China
- Volunteers
- 105 people
- Sponsor
- Eye & ENT Hospital of Fudan University
Cataracts, Astigmatism
Investigation of Corneal Aberrations and Visual Outcomes in Patients Implanted With an AcrySof Toric Intraocular Lens (IOL)
A prospective evaluation of postoperative corneal aberrations and visual parameters (e.g. visual acuity) in patients implanted with an AcrySof Toric IOL.
- Trial name
- NCT00878839
- Testing
- Toric
- Sponsor
- Alcon Research
Corneal Astigmatism
Prospective Evaluation of Limbal Relaxing Incision (LRI) in Conjunction With Phacoemulsification Surgery for Astigmatic Correction in Chinese Eyes
The main purpose of this study is to evaluate the use of limbal relaxing incision (LRI) for astigmatic correction. LRI is a procedure where a pair of incisions is made in the peripheral part of the cornea so as to alter its shape…
- Trial name
- NCT01122992
- Testing
- Limbal relaxing incision
- Where
- Singapore
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Singapore National Eye Centre
Astigmatism, Cataract
Astigmatism Management With Iris-registration Guided Corneal Relaxing Incisions or Toric IOLs During Cataract Surgery
Most of the patients presenting for cataract surgery also have pre-existing corneal astigmatism which if left uncorrected can adversely affect visual and refractive outcomes after cataract surgery.
- Trial name
- NCT05561296
- Testing
- Femtosecond laser assisted cataract surgery with astigmatism management
- Where
- United States
- Volunteers
- 50 people
- Sponsor
- Kenneth J Rosenthal
Cataract, Corneal Astigmatism
Post-Approval Study of the TECNIS SYMFONY® Toric Lenses
This study is a prospective, multicenter, bilateral, non-randomized, open-label, comparative, 6-month clinical study conducted at up to 50 sites in the USA.
- Trial name
- ANCORA (NCT03791619)
- Testing
- Higher Cylinder Toric IOL, Lower Cylinder Toric IOL
- Where
- 23 sites in United States
- Volunteers
- 475 people
- Sponsor
- Johnson & Johnson Surgical Vision, Inc.
Astigmatism
Arcuate Incisions With Light Adjustable Lens for Astigmatism Correction in Lens Surgery
This study aims to evaluate the safety and effectiveness of femtosecond laser arcuate corneal relaxing incisions (AK) combined with Light Adjustable Lens (LAL) implantation for correcting pre-existing corneal astigmatism in…
- Trial name
- NCT07140653
- Testing
- Femto arcs, Light Adjustable Lens (LAL)
- Where
- 2 sites in United States
- Volunteers
- 60 people
- Sponsor
- Center For Sight
Cataract
Comparison of Femto-laser and Manually Created Clear Corneal Incisions During Cataract Surgery
The aim of this study is to test the hypothesis, that in terms of Surgically Induced corneal Astigmatism (SIA), Higher-order Aberrations (HOA), and wound geometry the femtosecond clear corneal incisions (CCIs) created during…
- Trial name
- Z8_CCI (NCT04082273)
- Testing
- Femtosecond Laser for Cataract Surgery, Conventional Cataract Surgery
- Where
- Switzerland
- Volunteers
- 80 people
- Sponsor
- Ziemer Ophthalmic Systems AG
Astigmatism, Cataract
Limbal Relaxing Incision Versus Toric Intraocular Lens for Corneal Astigmatism During Cataract Surgery.
This study will compare toric intra-ocular lens (IOL) with limbal relaxing incisions (LRI) in correcting astigmatism in patient undergoing standard cataract surgery.
- Trial name
- NCT02067429
- Testing
- Limbal Relaxing Incisions, Toric Intraocular Lens
- Where
- United Kingdom
- Volunteers
- 80 people
- Sponsor
- Christin Henein