Contact Lens Comfort, Visual Acuity
Conditions
Brief summary
A comparison of two lens designs manufactured in the same material. The hypothesis is the subjectively rated performance of comfort, vision and lens handling will be better with the modified design compared to the initial design
Detailed description
The objectives of the study are 1. to identify possible reasons for the different comfort and vision experience in Japanese CL wearers compared to Caucasian CL wearers and 2. to assess whether the modification of lens thickness in the optical zone results in increased comfort and reduced visual acuity fluctuations in Caucasian eyes.
Interventions
DEVICEMenicon Modified Lens Design
Randomized in a daily wear, single day (6 hours or more) evaluation
Sponsors
Menicon Co., Ltd.
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)
Masking description
This will be a double-masked study, with both the study participants and study investigators being masked to the order of lens wear for the initial and modified DD lens design. Study lenses will be dispensed to the participants at V2 and V4 by unmasked research assistants from paper cups. Lenses and blister-pack solution will be directly transferred into the paper cups, and only the paper cups will be taken to the examination room where lenses are being dispensed.
Intervention model description
This will be a double-masked, cross-over, bilateral wear study design with five (5) study visits across three (3) study visit days. Participants will be dispensed and wear both the initial and modified lens design for a total of six (6) hours each on two (2) separate visit days, with the order of lens wear being randomized; participants will be allowed to leave the CCLR on their lens wearing days between dispense and follow-up visit.
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
1. Is at least 18 years of age and has full legal capacity to volunteer; 2. Has read and signed an information consent letter; 3. Is willing and able to follow instructions and maintain the appointment schedule; 4. Is of Caucasian heritage; 5. Habitually wears soft spherical daily disposable contact lenses with a power between -0.50 to -2.75D (inclusive); 6. Demonstrates an acceptable fit with both study CL designs (initial & modified); 7. Is correctable to a visual acuity of 0.20 LogMAR (approximately 20/30) or better (in each eye) with both study CL designs; 8. Has a manifest cylindrical spectacle refraction that does not exceed -1.00DC in either eye; 9. Should own a wearable pair of spectacles. -
Exclusion criteria
1. Is participating in any concurrent clinical or research study; 2. Has any known active\* ocular disease and/or infection; 3. Has a systemic condition that in the opinion of the investigator may affect a study outcome variable; 4. Is using any systemic or topical medications that in the opinion of the investigator may affect a study outcome variable; 5. Has known sensitivity to the diagnostic pharmaceuticals to be used in the study; 6. Is pregnant, lactating or planning a pregnancy at the time of enrolment (by self-report); 7. Is aphakic; 8. Has undergone refractive error surgery; -
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Participant's subjective rating of comfort, Questionnaire | 2 Days | Participants rate their eye comfort by subjective questionnaire (non-annotated scale, 0-100, 0=painful, 100=can't feel the lenses) |
| Participant's subjective rating of vision, Questionnaire | 2 Days | Participants rate their vision by subjective questionnaire (non-annotated scale, 0-100, 0=not at all sharp/clear, 100=sharp/clear |
| Participant's subjective rating of lens handling, Questionnaire | 2 Days | Participants rate their ability to handle the contact lens by subjective questionnaire (non-annotated scale, 0-100, 0=very difficult, 100=very easy |
Countries
Canada
Outcome results
None listed