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This clinical study will investigate the difference in ocular characteristics between contact lens wear and spectacle wear among habitual contact lens wearers, using a 2-treatment by 2-period cross-over design. There will be a 1-week washout between the two study periods to eliminate any potential carryover effect.
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Inclusion and exclusion criteria
Inclusion Criteria:
Potential subjects must satisfy all of the following criteria to be enrolled in the study:
The subject will have completed the pre-screening Classification questionnaire.
Subject must have a working cell phone capable of sending and receiving text messages.
The subject must read, understand, and sign the STATEMENT OF INFORMED CONSENT and receive a fully executed copy of the form.
Appear able and willing to adhere to the instructions set forth in this clinical protocol.
Between 18 and 42 (inclusive) years of age at the time of screening
Be a current soft contact lens wearer in both eyes with a minimum of 5 days/week wear time over the last 1 month by self-report OR be a full-time spectacle wearer (7 days/ week) without contact lens wear over the last 6 months.
Subjects must be willing to adhere to spectacle-only refractive correction for approximately 1 week.
Subjects must possess a functional / usable pair of spectacles with which they can achieve 20/20 Snellen visual acuity or better at distance and near, and bring them to the visit
The subject's vertex corrected spherical distance refraction must be in the range (+/-0.25 D) of -2.00 D to -6.00 D (inclusive) in each eye.
The subject's vertex corrected refractive cylinder must be equal or less than -0.75 diopters in each eye.
Contact lens wearers must have spherical best corrected visual acuity of 20/25 or better in each eye.
Snellen visual acuity at distance and near must be within 1 line between subject's own spectacle and the manifest refraction, distance and near, OD & OS.
Exclusion Criteria:
Potential subjects who meet any of the following criteria will be excluded from participating in the study:
Primary purpose
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Masking
78 participants in 2 patient groups
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Data sourced from clinicaltrials.gov
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