Custom Anterior Surfacing of Scleral Lens for Vision Quality Improvement in Patients With Keratoconus

Keratoconus Clinical Trial

Official title:

Custom Anterior Surfacing of Scleral Lens for Vision Quality Improvement in Patients With Keratoconus

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03647046
• Other study ID #: 72749
• Status: Completed
• Phase: N/A
• Start date: October 8, 2018
• Est. completion date: January 20, 2020

Study information

• Verified date: December 2019
• Source: University of Rochester
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The goal of the study is to examine the effects of custom front-surface wavefront correction on visual performance, and on neutralization of higher order aberrations, in patients wearing a scleral lens device. The investigators will study patients with keratoconus, the most common type of corneal ectasia, who have already been fitted with the BostonSight BSS (Boston Sight Scleral) for improved visual function.

Description:

This study will be a single center, double-masked collection of data taking place at the Flaum Eye Institute. Informed consent will be obtained from all subjects after a thorough explanation of the nature and possible risks of the study. Flaum Eye Institute electronic health records of existing patients will first be screened by an optometrist or ophthalmologist to verify that they do not fall under the exclusion criteria. Some study communication regarding scheduling will be done over the phone or email. The screening will be similar to a standard eye exam (without eye dilation) and will include a slit lamp examination as well as visual acuity and basic vision evaluation.

The study eye will be chosen based on inclusion criteria; if both eyes qualify, the eye with worse best corrected acuity will be chosen. A new lens will be manufactured for the subject after the screening visit and will be given to the subject during the following study visit. This is done to ensure fully neutralized spherical refractive effort and positional stability. If screening evaluation reveals that the current lens does not fully neutralize spherical refractive error or that the current lens is not positionally stable, a baseline lens will be manufactured that corrects this. The subject will be allowed to keep the old lens if he or she so chooses.

At the second visit, the patient's vision and fit will be evaluated with the optimized baseline BSS lens. Visual acuity and device fit will be evaluated and recorded. If the BSS device fit is still not optimized, then a new device will be made , and the second visit evaluation will be rescheduled. Once the baseline lens design is determined to be satisfactory, the patient will have their wavefront aberration measured with a wavefront sensor. Investigators will dilate the pupil pharmacologically with phenylephrine (2.5%) and tropicamide (1%) and take wavefront measurements of the optical aberrations of the subject's eye wearing the baseline lens using a portable, non-invasive wavefront analyzer designed to measure highly aberrated eyes (Ovitz, P10/EyeProfiler). The investigators will then design and manufacture a study lens that is identical in design to the baseline BostonSight BSS lens except for a custom front surface designed to neutralize the optical aberrations measured with the wavefront analyzer. This HOA-optimized lens will be created prior to the third visit.

At the third visit the patient's vision and fit will be evaluated with the new HOA-optimized lens. A designated study team member will measure visual acuity and over-refraction of the patient. If an adjustment is needed for the lens, then a new device will be made, and the third visit evaluation will be rescheduled.

Once well-fitting baseline and HOA-optimized test lenses are established, both lenses will be remade and presented to the evaluator designated study team member in charge of evaluation and subject together in a masked fashion. During a fourth visit, the patient's vision will be extensively evaluated using standard non-invasive optometric measurements with each of the two lenses. First the patient will undergo a basic evaluation with each lens to ensure that the fit is correct. The patient will then undergo basic visual acuity; high and low contrast visual acuity, contrast sensitivity, and subjective vision scoring with each lens. The subject's wavefront aberration will also be measured again with each lens.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 12
• Est. completion date: January 20, 2020
• Est. primary completion date: January 20, 2020
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

A person will be included in the study if he/she:

• Is 18 years or older and has full legal capacity to volunteer.

• Has been diagnosed with Keratoconus;

• Has no other active ocular disease;

• Is currently wearing the BostonSight BSS in at least one eye ;

• Has non-spherical BostonSight BSS haptic design in the study eye;

• Has 20/400 or better best corrected visual acuity with pinhole 20/60 or better in the study eye;

• Is not pregnant or nursing;

• Has voluntarily agreed to participate in the study by signing the statement of informed consent;

A person will be excluded from the study if he/she:

• Is under the age of 18;

• Has best corrected visual acuity outside 20/400;

• Pregnant or nursing at the time of enrollment in the study;

Related Conditions & MeSH terms

• Keratoconus

Intervention

Device:
• Customized Scleral Lens
A wavefront customized scleral lens will be made for each subject and tested against a non-customized lens.

Locations

Country	Name	City	State
United States	Flaum Eye Institute, University of Rochester Medical Center	Rochester	New York

Sponsors (3)

Lead Sponsor	Collaborator
University of Rochester	Boston Sight, Ovitz Corporation

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Number of Participants With Normal Vision	Vision will be tested using the Basic Snellen Visual Acuity test and normal vision will be defined as 20/20.	30 minutes