Clinical Trials Logo

Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT03197272
Other study ID # PiXLMYOP-I
Secondary ID
Status Completed
Phase N/A
First received
Last updated
Start date April 21, 2016
Est. completion date November 30, 2020

Study information

Verified date December 2020
Source Umeå University
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

To evaluate the improvement in myopic refractive error and the corneal endothelial safety with a corneal crosslinking treatment regimen for mild myopia. The treatment involves a 4-mm central treatment zone in high oxygen environment without corneal epithelial debridement.


Description:

The study is designed as a prospective, single-masked intraindividually comparing randomized controlled trial involving healthy volunteers ≥18 years of age of both genders with mild myopia, performed at the Department of Clinical Sciences / Ophthalmology, Umeå University Hospital, Umeå, Sweden. The study involves 23 persons with a myopia of -0.5 to -2.5 diopters (D) and astigmatism of ≤0.75 D. All participants are treated with phototherapeutic intrastromal corneal collagen cross-linking (PiXL) without epithelial debridement (epi-on), after topical riboflavin. For myopia of less than 1.0D, 10 J/cm2 will be used, for higher levels of myopia 15J/cm2 will be used, and the treatment involves continuous delivery of oxygen around the eye using an oxygen mask to achieve an oxygen concentration of ≥90% during treatment. Participants will be randomized to receive ultraviolet (UV) light according to PiXL Protocol A in one eye and PiXL Protocol B in the other, which is masked to the participant. Both eyes will be treated during the same visit. Protocol A: UV irradiation in a central 4 mm homogenous zone of the cornea. Protocol B: UV irradiation in a central ring-shaped 4 mm area of the cornea. Patients are randomized utilizing a computer list of unique random numbers between 1 and 23; an even number will be treated with a homogeneous zone in the right eye; an uneven number with a homogeneous zone in the left eye. All patients are informed about the procedures and provide oral and written consent before inclusion in the study. At baseline, before treatment, each eye is evaluated with slit-lamp examination, subjective refraction, determination of uncorrected (UCVA) and best corrected (BSCVA) visual acuities using the LogMAR fast protocol and intraocular pressure (IOP) using Goldmann applanation tonometry. Each eye is photographed using the "25 pictures" program with the Pentacam HR® (Oculus, Inc. Lynnwood, WA) under standardized, mesopic light conditions. Keratometry readings, central corneal thickness and the average corneal densitometry values (corneal light backscatter), expressed as standardized gray scale units, GSU) is determined with the Pentacam HR®. Central corneal endothelial photographs are taken with the Topcon SP-2000P specular microscope (Topcon Europe B.V., Capelle a/d Ijssel, the Netherlands), and the corneal endothelial cell count is calculated from a cluster of 25 cells from each photograph. All the above mentioned investigations are repeated at 1, 3, 6,12 and 24 months after the treatment. At 1 week after treatment, UCVA is registered and a slit-lamp examination, a subjective comparison of discomfort and visual performance in each eye and an autorefractometer measurement are performed. One day after treatment the latter 3 examinations are performed.


Recruitment information / eligibility

Status Completed
Enrollment 23
Est. completion date November 30, 2020
Est. primary completion date October 31, 2020
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 18 Years to 35 Years
Eligibility Inclusion Criteria: - Spherical equivalent on distance subjective refraction between -0.50D and -2.50D. - Astigmatism = 0.75D - Stable myopia. Maximum change in refraction of 0.50D in the last 2 years. - Best corrected visual acuity of at least 0.00 logMAR (ETDRS chart). - Thinnest pachymetry reading = 440 µm. - No previous ocular surgery. - No cognitive insufficiency interfering with the informed consent. Exclusion Criteria: - History of or current ocular condition, disease, surgery or medication with ocular effects that could affect the outcomes of the treatment. - Allergy to any substance or device used in the study. - Cognitive insufficiency interfering with the informed consent.

Study Design


Related Conditions & MeSH terms


Intervention

Procedure:
PiXL
Phototherapeutic intrastromal corneal collagen cross-linking (PiXL) performed in a high-oxygen environment without corneal epithelial debridement, for treatment of mild myopia.

Locations

Country Name City State
Sweden Department of Clinical Sciences/Ophthalmology, Umeå University Umeå

Sponsors (2)

Lead Sponsor Collaborator
Umeå University Avedro, Inc.

Country where clinical trial is conducted

Sweden, 

Outcome

Type Measure Description Time frame Safety issue
Primary Change from baseline in uncorrected visual acuity Change from baseline in distance uncorrected visual acuity 1, 3, 6 and 12 months after treatment
Primary Change from baseline in spherical equivalent Change from baseline in spherical equivalent on subjective distance refraction 1, 3, 6 and 12 months after treatment
Secondary Change from baseline in corneal endothelial cell density Change from baseline in central corneal endothelial cell density 12 months after treatment
See also
  Status Clinical Trial Phase
Recruiting NCT04923841 - Myopia Control Using Bright Light Therapy, Myopic Defocus and Atropine N/A
Active, not recruiting NCT04080128 - Examination of Myopia Progression and Soft Bifocal Contact Lens Myopia Control N/A
Active, not recruiting NCT05275959 - Beijing (Peking)---Myopia and Obesity Comorbidity Intervention (BMOCI) N/A
Completed NCT04604405 - Effects of 650nm Low Energy Light on Human Retina and Choroid Microcirculation N/A
Recruiting NCT05594719 - The Effect of Sun-like Spectrum With Different Spectrum Composition on Retinal Blood Flow N/A
Completed NCT05594732 - The Effects of Different Outdoor Light Exposure Modes on Retinal Blood Flow N/A
Completed NCT04492397 - Comparing The Performance Of Two Different Daily Disposable Lenses (MIKI) N/A
Completed NCT04536571 - Vision Stability and Preference for Soft Toric vs. Soft Spherical Contact Lenses N/A
Completed NCT06046209 - Comparing a Monthly Replacement Lens Versus a Daily Disposable Lens N/A
Recruiting NCT06344572 - Pivotal Study of SAT-001 in Treatment of Pediatric Patient With Myopia Phase 3
Recruiting NCT05611294 - Contralateral Study of Topography Guided LASIK Versus Small Incision Lenticule Extraction N/A
Completed NCT05656885 - Clinical Evaluation of Two Frequent Replacement Soft Spherical Contact Lenses N/A
Active, not recruiting NCT05534022 - Clinical Evaluation of a Myopia Control Lens in Slowing Myopia Progression. N/A
Completed NCT03934788 - the Clinical Performance of the Oxysoft Daily Disposable Silicone Hydrogel Soft Contact Lens N/A
Completed NCT03701516 - Clinical Evaluation of Etafilcon A Contact Lenses Using a Novel Molding Process 2 N/A
Completed NCT05538754 - Post-Market Evaluation of the EVO ICL N/A
Completed NCT03139201 - Clinical Performance of the OxyAqua Daily Disposable Silicone Hydrogel Soft Contact Lens N/A
Completed NCT02555722 - Evaluation of the CooperVision, Inc. Fanfilcon A and Enfilcon A Daily Wear Contact Lenses When Used for Frequent Replacement for up to One (1) Month of Daily Wear N/A
Not yet recruiting NCT06009458 - Acuity 200™ (Fluoroxyfocon A) Orthokeratology Contact Lens for Overnight Wear N/A
Recruiting NCT05548478 - Corneal Endothelial Cell Injury Induced by Mitomycin-C N/A