80 studies found for:    Open Studies | "Refractive Errors"
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Rank Status Study
21 Not yet recruiting A Trial of Toric Versus Non-toric Intraocular Lenses in Phacoemulsification Cataract Surgery
Conditions: Cataract;   Astigmatism
Intervention: Device: Phacoemulsfication cataract surgery and intra-ocular lens implant
22 Recruiting Metabolic Screening in Patients With Donnai-Barrow Syndrome
Condition: Donnai-Barrow Syndrome
Intervention:
23 Unknown  Compare Anterior Chamber Biometry in Healthy and Post-LASIK Patients
Conditions: Myopia;   Astigmatism
Intervention:
24 Recruiting Wavefront-guided PRK vs Wavefront-optimized PRK
Conditions: Myopia;   Astigmatism
Interventions: Procedure: Wavefront-guided PRK;   Procedure: Wavefront-optimized PRK
25 Unknown  Clinical Evaluation of Toric Intraocular Lens Made by Aurolab
Condition: Astigmatism
Intervention: Device: Experimental - Toric Intraocular lenses
26 Unknown  Ocular Imaging With Spectral Domain Optical Coherence Tomography
Conditions: Healthy;   Myopia;   Hypermetropia
Intervention: Device: Spectral domain-OCT (Cirrus™ HD-OCT, Carl Zeiss Meditec AG)
27 Recruiting Family Myopia Study
Condition: Myopia
Intervention:
28 Recruiting CLARITI (TM) 1Day Multifocal Contact Lenses Performance and Acceptance Evaluation
Condition: Presbyopia Correction
Interventions: Device: Near Vision Spectacles (no contact lenses);   Device: CLARITI 1Day;   Device: Clariti 1Day
29 Not yet recruiting Neurovascular Coupling in Subjects With Amblyopia
Conditions: Amblyopia ex Strabismus;   Amblyopia ex Anisometropia
Interventions: Device: Dynamic Vessel Analyzer;   Other: Laser Doppler Velocimetry;   Device: 7-Tesla MRI;   Other: Pattern electroretinography
30 Not yet recruiting Refraction Determination Analysis
Conditions: Myopia,;   Hyperopia,;   Astigmatism,;   Presbyopia,;   Eye Strain,
Interventions: Device: Telemedicine refraction;   Device: Traditional refraction
31 Not yet recruiting Myopia Control With the Multi-segment Lens
Condition: Myopia
Intervention: Device: Multiple-Segment spectacle lens
32 Unknown  Visual and Economic Profits of ReSTOR® Multifocal Intraocular Lenses (IOL) on Public Health Patients in Spain
Condition: Presbyopia
Intervention: Procedure: Cataract surgery
33 Unknown  Intrastromal Correction of Ametropia by a Femtosecond Laser
Conditions: Presbyopia;   Myopia;   Hyperopia;   Astigmatism
Interventions: Device: Intrastromal Correction of Presbyopia;   Device: Intrastromal correction of Myopia;   Device: Intrastromal Correction of Hyperopia;   Device: Intrastromal Correction of Myopia incl. Astigmatism;   Device: Intrastromal Correction of Hyperopia incl. Astigmatism
34 Recruiting Effect of Orthokeratology Versus Spectacles on Myopia Progression in Chinese Children: A Crossover Trial
Condition: Myopia
Interventions: Device: Orthokeratology;   Device: Spectacle
35 Unknown  SUPRACOR for Myopia and Myopic Astigmatism
Conditions: Myopia;   Myopic Astigmatism;   Presbyopia
Intervention: Procedure: SUPRACOR
36 Recruiting Use of the Visumax™ Femtosecond Laser
Condition: Myopia
Intervention: Device: Treatment with the VisuMax™ Femtosecond Laser
37 Recruiting Myopia Prevalence in Canadian School Children - a Pilot Study
Condition: Myopia
Intervention:
38 Unknown  Study of Myopia Prevention in Children With Low Concentration of Atropine
Condition: Myopia
Interventions: Drug: atropine;   Drug: tropicamide
39 Recruiting A Prospective Safety and Effectiveness Study of the 500 Hz Technolas Perfect Vision Excimer Laser in Asian Eyes Using LASIK
Conditions: Myopia;   Hyperopia;   Presbyopia
Intervention: Device: Proscan, Zyoptix and Supracor
40 Recruiting Clinical Performance of Habitual Wearers of Avaira Toric When Refitted With Clariti Toric Lenses
Condition: Astigmatism
Interventions: Device: somofilcon A;   Device: enfilcon A

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Indicates status has not been verified in more than two years