The effect of corneal outer surface shape on orthokeratology contact lens decentration in young healthy adults with short-sightedness

Withdrawn

• Conditions: Myopia; Eye - Diseases / disorders of the eye

• Registration Number: ACTRN12618000184279
• Lead Sponsor: niversity of New South Wales

Brief Summary

Not available

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Start: 2018-02-05
• Last Update Posted: 28 January 2019

Recruitment & Eligibility

• Status: Withdrawn
• Sex: All
• Target Recruitment: 35

Inclusion Criteria

1. Individuals aged between 18 and 40 years
2. Have short sightedness between -1.00D and -5.00D with less than 1.50D of corneal astigmatism
3. Have horizontal visible iris diameter (corneal diameter) that is at least 11.5 mm
4. No contraindications for rigid contact lens wear and have not previously worn rigid contact lenses
5 Current wearers of soft contact lens will be required to discontinue 2 days prior to screening

Exclusion Criteria

1. Persons with strabismus (squint or cross eyed) or amblyopia (lazy eye)
2. Systemic health conditions or other eye conditions that may affect the quality of tears or that may affect refractive development.
3. Previous history of eye operations, injury or chronic eye conditions.
4. Medications used for systemic or ocular health that may interfere with contact lens wear or ocular surface.
5. Not willing to comply with the located treatment and follow-up schedule.

Study & Design

• Study Type: Interventional
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
A difference in the amount of treatment zone decentration will be determined (through a custom software) between interventional and comparator groups using the corneal topographic maps captured by the Medmont E300 corneal topographer. [Measurements will be taken at baseline before any lens wear, after 1, 7 and 14 (primary time point) nights of lens wear.]

Secondary Outcome Measures

Name	Time	Method
A difference in the amount of peripheral refraction will be measured using the Shin-Nippon NVisionK 5001 autorefractor between interventional and comparator groups. [Measurements will be taken at baseline before any lens wear, after 1, 7 and 14 nights of lens wear.]