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refractive errors

Showing 1 - 25 of 1,438
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Prevalence of Refractive Errors in Primary School Children

Not yet recruiting
  • Refractive Errors
  • cycloplegic refraction
  • (no location specified)
Mar 12, 2023

Angle Kappa , Corneal High Order Aberrations and Total Eye

Not yet recruiting
  • Aberration, Corneal Wavefront
  • Pentacam Imaging
  • (no location specified)
Feb 14, 2023

Refractive Errors, Astigmatism Trial (EyeQue VisionCheck, Phoropter)

Not yet recruiting
  • Refractive Errors
  • Astigmatism
  • EyeQue VisionCheck
  • Phoropter
  • (no location specified)
Sep 6, 2023

Refractive Surgery on OCT Measurements in the Eye

Not yet recruiting
  • Optical Coherence Tomography
  • +2 more
  • Optical coherence tomography
  • Omaha, Nebraska
    University of Nebraska Medical Centre
May 9, 2023

Anxiety-related Fixation Instability During LASIK

Completed
  • Refractive Errors
  • Laser in situ keratomileusis (LASIK)
  • Assiut, Egypt
    Tiba Eye Center
Nov 27, 2023

Refractive Errors Trial in Hong Kong (3000K Reading lamp, 4500K Reading lamp, 6500K Reading lamp)

Recruiting
  • Refractive Errors
  • 3000K Reading lamp
  • +2 more
  • Hong Kong, Kowloon, Hong Kong
    Optometry Research Clinic
Feb 14, 2023

Refractive Errors, Myopic Astigmatism Trial in Cairo (Small Incision Lenticule Extraction (SMILE))

Recruiting
  • Refractive Errors
  • Myopic Astigmatism
  • Small Incision Lenticule Extraction (SMILE)
  • Cairo, Egypt
    Al Watany Eye Hospital
Sep 25, 2023

Air Optix® Night and Day® Aqua Continuous Wear

Not yet recruiting
  • Refractive Errors
  • Lotrafilcon A contact lenses
  • Balafilcon A contact lenses
  • (no location specified)
Aug 8, 2023

Refractive Errors Trial in Freetown (Eyeglasses, Prescription slip)

Not yet recruiting
  • Refractive Errors
  • Eyeglasses
  • Prescription slip
  • Freetown, Sierra Leone
    Innovations for Poverty Action (IPA)
Sep 29, 2023

ORA and Residual Refractive Astigmatism After SMILE

Completed
  • Refractive Errors
  • Astigmatism
  • Small Incision Lenticule Extraction
  • Taipei, Taiwan
    Taipei Nobel Eye Clinic
Oct 31, 2022

Myopia, Amblyopia, Hyperopia Trial (Fitz Frames 3-D Printed Glasses)

Not yet recruiting
  • Myopia
  • +3 more
  • Fitz Frames 3-D Printed Glasses
  • (no location specified)
Jan 9, 2023

Refractive Errors, Myopia, Myopic Astigmatism Trial in Cairo (Refractive Surgery)

Recruiting
  • Refractive Errors
  • +2 more
  • Refractive Surgery
  • Cairo, Egypt
    Alwatany Eye Hospital
Jan 1, 2023

Retinal Detachment, Refractive Errors Trial in Banha (Vitrectomy)

Recruiting
  • Retinal Detachment
  • Refractive Errors
  • Vitrectomy
  • Banhā, QA, Egypt
    Benha University
Oct 13, 2022

Cycloplegia, Refractive Errors, Esotropia Trial in Irbid, Doha (Cyclopentolate, Tropicamide)

Recruiting
  • Cycloplegia
  • +3 more
  • Irbid, Jordan
  • +1 more
Oct 5, 2023

Contact Lens Complication, Astigmatism, Refractive Errors Trial in Pittsburg, Coldwater (TOTAL30 for Astigmatism Contact Lenses)

Not yet recruiting
  • Contact Lens Complication
  • +2 more
  • TOTAL30 for Astigmatism Contact Lenses
  • Pittsburg, Kansas
  • +1 more
Sep 18, 2023

Visual Acuity in Pre-school Students

Not yet recruiting
  • Visual Acuity
  • +3 more
  • Diagnostic Test: Distance Visual Acuity Examination
  • Alexandroupolis, Evros, Greece
    Democritus University of Thrace
Apr 18, 2023

Air Optix® Night and Day® Aqua Daily Wear

Not yet recruiting
  • Refractive Errors
  • +2 more
  • Lotrafilcon A contact lenses
  • Balafilcon A contact lenses
  • Fort Worth, Texas
    Contact Alcon Call Center for Trial Locations
Jul 26, 2023

Refractive Errors Trial (Multifocal D +2.50 add & 0.01% atropine)

Completed
Has Results
  • Refractive Errors
  • Multifocal D +2.50 add & 0.01% atropine
  • (no location specified)
Nov 14, 2022

Air Optix Plus HydraGlyde Multifocal Daily/Extended Wear Contact

Not yet recruiting
  • Refractive Errors
  • Lotrafilcon B multifocal soft contact lenses
  • Comfilcon A multifocal soft contact lenses
  • (no location specified)
May 24, 2023

Peripapillary Atrophy to Diagnose Glaucoma in High Myopia

Not yet recruiting
  • Myopia
  • +4 more
  • OCT imaging
  • Guangzhou, Guangdong, China
    Zhongshan Ophthalmic Center, Sun Yat-sen University
Jul 27, 2023

Refractive Errors Trial in United States (Delefilcon A contact lenses)

Not yet recruiting
  • Refractive Errors
  • Delefilcon A contact lenses
  • Eden Prairie, Minnesota
  • +3 more
Sep 13, 2023

Cataract, Glaucoma, Age Related Macular Degeneration Trial in Bharatpur (Community-based screening program, Cataract camp

Completed
  • Cataract
  • +4 more
  • Community-based screening program
  • +2 more
  • Bharatpur, Chitwan, Nepal
    Bharatpur Eye Hospital
Dec 15, 2022

Refractive Error Trial in Palo Alto, Draper (ELITA System)

Not yet recruiting
  • Refractive Error
  • ELITA System
  • Palo Alto, California
  • +1 more
Jan 25, 2023

Errors of Refraction Among Primary School Children

Recruiting
  • Error, Refractive
  • Visual acuity measurement
  • Minya, Minia, Egypt
    Faculty of Medicine
Oct 7, 2022

Refractive Ametropia (Myopia, Hyperopia and Astigmatism) Trial (REVIVE Contact Lens)

Not yet recruiting
  • Refractive Ametropia (Myopia, Hyperopia and Astigmatism)
  • REVIVE Contact Lens
  • (no location specified)
Sep 19, 2023