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This is a crossover study of two types of contact lenses (toric orthokeratology and soft multifocals). Primary aims are to quantify correction of astigmatism, subjective and objective visual performance, aberrometry, peripheral refraction and bacterial bioburden between toric orthokeratology and soft toric multifocal contact lenses.
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Layout table for eligibility information
Ages Eligible for Study:
18 Years to 39 Years (Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
18 to 39 years of age (inclusive)
Able to read and understand the study informed consent
Plano to -5.00 D (inclusive) vertex corrected sphere power in each eye
1.25 to -3.50 D (inclusive) vertex corrected astigmatism in each eye
Best corrected acuity of 20/25 or better in each eye
No history of ocular pathology or surgery
No significant binocular vision or accommodation abnormality (i.e. strabismus, amblyopia)
No gas permeable lens wear for at least 1 month
No systemic or ocular contraindications for contact lens wear
Not pregnant/lactating (by self-report)
Adults unable to consent
Individuals who are not yet adults (infants, children, teenagers)
Students for whom one of the principal investigators have direct access to/influence on grades would be consented and seen by another investigator for all visits.