None listed
Conditions
Brief summary
To compare the short-term effects (2 weeks) of two different orthokeratology lens systems. Orthokeratology is the application of specially designed rigid contact lenses overnight, to change the corneal shape and reversibly and temporarily reduce short-sightedness. The purpose is to reduce your myopia with two different types of orthokeratology contact lenses and observe the changes in the eyes with advanced clinical instruments.
Interventions
Unlike conventional rigid gas permeable contact lenses that are steeper in curvature in the centre and flatten towards the periphery, reverse geometry lenses are designed to have a flatter central portion and become steeper in the periphery, in order to alter the shape of the cornea in the process known as orthokeratology. Reverse geometry lenses will be worn in both eyes of each subject, but each eye will wear a different proprietary orthokeratology lens design (either Capricornia BE lens, or P
Unlike conventional rigid gas permeable contact lenses that are steeper in curvature in the centre and flatten towards the periphery, reverse geometry lenses are designed to have a flatter central portion and become steeper in the periphery, in order to alter the shape of the cornea in the process known as orthokeratology. Reverse geometry lenses will be worn in both eyes of each subject, but each eye will wear a different proprietary orthokeratology lens design (either Capricornia BE lens, or Paragon CRT lens) selected in a randomised manner. The participants will be required to wear the lenses overnight for 14 days.
Sponsors
Faculty of Medical and Health Sciences, The University of Auckland
Study design
Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Treatment
Masking
Blinded (masking used)
Eligibility
Sex/Gender
All
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
Low myopia (<4.00D) Low with-the-rule astigmatism (<0.75DC) No against-rule-astigmatism Anisometropia <0.50D
Exclusion criteria
Myopia >4.00D High with-the-rule astigmatism >0.75DC Against-rule-astigmatism Anisometropia >0.50DS
Outcome results
None listed