Clinical Performance of Habitual Wearers of Avaira Toric When Refitted With Clariti Toric Lenses

Study Overview
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Brief Summary
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The aim of this dispensing study is to evaluate the clinical performance of existing wearers of Avaira toric lenses following a refit with Clariti toric over 1 month of daily wear.

Detailed Description
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This is a 30-subject, prospective dispensing study comparing the clinical performance of the subjects' habitual Avaira toric lenses following a refit with Clariti toric lenses. Subject's habitual Avaira toric lenses will be evaluated at the first visit and then re-fitted with a pair of Clariti toric lenses for 1 month of daily wear. After the dispensing visit, subjects will return for evaluations at 1 week, 2 weeks and 4 weeks.

Official Title
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Clinical Performance of Habitual Wearers of Avaira Toric (Enfilcon A) When Refitted With Clariti Toric (Somofilcon A) Lenses for 1 Month.

Conditions
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Astigmatism

Intervention / Treatment
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* Device: somofilcon A


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Is between 18 and 40 years of age (inclusive) Has had a self-reported visual exam in the last two years Is an adapted Avaira toric contact lens (CL) wearer (at least 1 week of wear in Avaira toric) Has a contact lens spherical prescription between +6.00 to - 8.00 (inclusive) Have no less than 0.75D of astigmatism and no more than 1.75 D in both eyes. Can achieve best corrected spectacle distance visual acuity of 20/25 (0.10 logMAR) or better in each eye. Can achieve a distance visual acuity of 20/30 (0.18 logMAR) or better in each eye with the study contact lenses. Has clear corneas and no active ocular disease Has read, understood and signed the information consent letter. Patient contact lens refraction should fit within the available parameters of the study lenses. Is willing to comply with the wear schedule (at least 5 days per week, > 8 hours/day assuming there are no contraindications for doing so). Is willing to comply with the visit schedule Exclusion Criteria: Is not a habitual wearer of Avaira toric lenses Has a CL prescription outside the range of the available parameters of the study lenses. Has a spectacle cylinder less than -0.75D or more than -1.75 D of cylinder in either eye. Has a history of not achieving comfortable CL wear (5 days per week; > 8 hours/day) Has contact lens best corrected distance vision worse than 20/25 (0.10 logMAR) in either eye. Presence of clinically significant (grade 2-4) anterior segment abnormalities Presence of ocular or systemic disease or need of medications which might interfere with contact lens wear. Slit lamp findings that would contraindicate contact lens wear such as: Pathological dry eye or associated findings Pterygium, pinguecula, or corneal scars within the visual axis Neovascularization > 0.75 mm in from of the limbus Giant papillary conjunctivitis (GCP) worse than grade 1 Anterior uveitis or iritis (past or present) Seborrheic eczema, Seborrheic conjunctivitis History of corneal ulcers or fungal infections Poor personal hygiene Has a known history of corneal hypoesthesia (reduced corneal sensitivity) Has aphakia, keratoconus or a highly irregular cornea. Has Presbyopia or has dependence on spectacles for near work over the contact lenses. Has undergone corneal refractive surgery. Is participating in any other type of eye related clinical or research study.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: enfilcon A<br>All participants are habitual wearers of enfilcon A lens who are refitted with somofilcon A lens | Device: somofilcon A<br>* somofilcon A lens<br>|
| Experimental: somofilcon A<br>All participants are habitual wearers of enfilcon A lens who are refitted with somofilcon A lens | Device: somofilcon A<br>* somofilcon A lens<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Visual Acuity - Enfilcon A and Somofilcon A | Monocular and binocular logMAR visual acuity for enfilcon A / somofilcon A assessed at baseline and somofilcon A lenses assessed at 1 week, 2 week, 4 week. | Baseline, 1 week, 2 week, 4 week | 
| Subjective Assessments- Enfilcon A and Somofilcon A | Subjective assessments for: comfort, dryness, handling, overall lens fit, and overall vision satisfaction. Enfilcon A was assessed at baseline and somofilcon A lenses assessed at 1 week, 2 week, 4 week. Scale(s): comfort (0=very poor; 10=excellent), dryness (0=very dry; 10=no dryness), handling (0=very difficult; 10=very easy), overall lens fit (0=very unstable; 10=very stable), overall vision satisfaction (0=very unsatisfied; 10=very satisfied) | Baseline, 1 week, 2 week, 4 week |