Comparative Clinical Evaluation of Soft Toric Lens Designs
Study Overview
Status
Status
Conditions
Conditions
Intervention / Treatment
Intervention / Treatment
Study Type
Study Type
Enrollment (Actual)
Enrollment
Phase
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
-
Farnham, United Kingdom, GU9 7EN
-
-
Participation Criteria
Eligibility Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Be greater than or equal to 18 years old.
- Read, understand, and sign written Statement of Informed Consent.
- Appear able and willing to adhere to the instructions set forth in this clinical protocol.
- Be existing soft contact lens wearers (no extended wear in the last 3 months, but silicone hydrogels in daily wear are allowed).
- Require a visual correction in both eyes (monovision allowed but no monofit).
- Have a spherical contact lens requirement in the range -0.50D to -6.00D.
- Have astigmatism of between -0.50 and -2.00DC in both eyes.
- Monocular distance visual acuity correctable to 6/9 (0.2 logMAR) or better in each eye with best sphero-cylindrical refraction.
- Have normal eyes with no evidence of any ocular abnormality or disease. For the purposes of this study a normal eye is defined as one having: Clear cornea, No anterior segment disorder, No clinically significant slit lamp findings (i.e. oedema, staining, scarring, vascularisation, infiltrates or abnormal opacities), No other active ocular disease or recent surgery
Exclusion Criteria:
- Having worn RGP contact lenses within the last 30 days or PMMA contact lenses within the last 3 months.
- Clinically significant corneal oedema, corneal vascularisation, corneal staining, tarsal abnormalities, bulbar injection or any other abnormality of the cornea that would contraindicate contact lens wear.
- Extended lens wear in last 3 months.
- Any systemic or topical medications that will in the investigator's opinion affect ocular physiology or contact lens performance.
- Any systemic disease affecting ocular health.
- Abnormal lacrimal secretions.
- Keratoconus or other corneal irregularity.
- Pregnancy, lactating or planning a pregnancy at the time of enrolment.
- Participation in any concurrent clinical trial.
- Any previous anterior ocular surgery.
- Subjects who are known to have an infectious systemic disease (e.g., hepatitis, tuberculosis).
- Subjects who are known to have an immunosuppressive disease (e.g., HIV positive).
- Subjects who are known to have diabetes.
- Employees or family members of the Research site, Principal Investigator or study team.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: TREATMENT
- Allocation: RANDOMIZED
- Interventional Model: CROSSOVER
- Masking: SINGLE
Number of Arms
Arms and Interventions
Participant Group / ArmParticipant Group / Arm |
Intervention / TreatmentIntervention / Treatment |
|---|---|
|
OTHER: etafilcon A / nelfilcon A / Filcon II 3
etafilcon A worn first then nelfilcon A worn second with Filcon II 3 worn third.
|
A daily wear contact lens
Other Names:
A daily wear contact lens
Other Names:
a daily disposable
Other Names:
|
|
OTHER: nelfilcon A / etafilcon A / Filcon II 3
nelfilcon A worn first then etafilcon A worn second with Filcon II 3 worn third.
|
A daily wear contact lens
Other Names:
A daily wear contact lens
Other Names:
a daily disposable
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
|
Phase I: Absolute Lens Rotation
Time Frame: At 1-min after lens insertion during Phase I
|
At 1-min after lens insertion, lens orientation position was assessed on a scale of 0-180 degree on both eyes.
|
At 1-min after lens insertion during Phase I
|
|
Phase I: Absolute Lens Rotation
Time Frame: 3 min after lens insertion during Phase I
|
Lens orientation position as assessed on a scale of 0-180 on both eyes.
|
3 min after lens insertion during Phase I
|
Secondary Outcome Measures
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
|
Phase I: Time to Lens Settling
Time Frame: 5 minutes after lens insertion during Phase I
|
With random insertion and natural blinking, the slit lamp video was used to measure the time of lens settling.
|
5 minutes after lens insertion during Phase I
|
|
Phase I: Number of Blinks Until Settled
Time Frame: Baseline to 5 minutes during Phase I
|
Number of blinks for the right eye was counted until lens settling using headcam video.
|
Baseline to 5 minutes during Phase I
|
Other Outcome Measures
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
|
Phase II: Absolute Rotation
Time Frame: 1-minute during Phase II
|
Absolute rotation of the lens (degrees) at 1-minute post-fit on both eyes.
Filcon II 3 lens was only used for comparison in phase II of the study per study protocol.
|
1-minute during Phase II
|
Collaborators and Investigators
Sponsor
Sponsor
Study record dates
Study Major Dates
Study Start
Study Start
Primary Completion (ACTUAL)
Primary Completion
Study Completion (ACTUAL)
Study Completion
Study Registration Dates
First Submitted
First Submitted
First Submitted That Met QC Criteria
First Submitted That Met QC Criteria
First Posted (ESTIMATE)
First Posted
Study Record Updates
Last Update Posted (ACTUAL)
Last Update Posted
Last Update Submitted That Met QC Criteria
Last Update Submitted That Met QC Criteria
Last Verified
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
Other Study ID Numbers
- CR-4582
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