Validation of Innovative Scheimpflug Topography Derived RGP Contact Lens

Status Completed

Clinical Trial Summary

The goal of this Prospective, single-site, cohort study is to validate rigid gas permeable corneal contact lens (RGP) designs for keratoconus derived from combining the data from corneal topography scans and contact lenses ordered in patients with keratoconus (KC) attending a UK tertiary NHS Hospital contact lens clinic. The main questions it aims to answer are: - Does a Scheimpflug topography derived RGP contact lens design for keratoconus have the equivalent overall contact lens fit as the patients' own lens? - Is the number of trial lenses required to fit a patient is reduced compared to standard practice? - Is the time taken to fit a contact lens is reduced compared to standard practice? - Is there user acceptance of the new lens? - Are the Axial ege lift (AEL) changes clinically significant? There will be 3 work packages WP1: For each participant data collection will take place over two visits. • Visit 1: Pentacam topography scans and optimal 'virtual' lens selection will take place. • • Visit 2: Participants are fitted with 4 contact lenses (i) the optimal lens design as specified by the virtual fitting module, (ii) a contact lens with a clinically significant step flatter AEL (iii) a contact lens steeper in axial edge lift (AEL) (iv) the participant's own contact lens. Each CL fit will be assessed with slit lamp photography according to the standardised method proposed by Wolffsohn et al. (2013), Anterior segment OCT MS39) (CSO Hansom Instruments, UK) and best-corrected visual acuity with each lens design using high-contrast logMAR . WP2. Participants will attend one appointment where a traditional lens fit, and a lens fitted using the topography guided 'virtual' module will be undertaken (with the fitting method selected for each eye randomised). For each fitting method the total fitting time will be measured and the total number of trial contact lenses used. Patients will be invited to complete a questionnaire that probes their satisfaction of this process. WP3. Clinicians not involved in the study will be invited to examine a demo version of the virtual fitting module and complete the validated system usability scale tool.

Clinical Trial Description

n/a

Study Design

Related Conditions & MeSH terms

Keratoconus

Clinical Trial Details

NCT number	NCT06312163
Study type	Observational
Source	Moorfields Eye Hospital NHS Foundation Trust
Contact
Status	Completed
Phase
Start date	June 6, 2022
Completion date	December 15, 2023

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See also
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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.

Validation of Innovative Scheimpflug Topography Derived RGP Contact Lens Designs In Optometry Network — VISION

Clinical Trial Summary

Clinical Trial Description

Study Design

Related Conditions & MeSH terms