Performance Evaluation of Two Silicone Hydrogel Toric Lens Designs in Habitual Soft Contact Lens Wearers

Inclusion Criteria

• •1. Is between 18 and 39 years of age (inclusive) and has full legal capacity to volunteer;
• •2. Has read and signed an information consent letter;
• •3. Self-reports having a full eye examination in the previous two years;
• •4. Anticipates being able to wear the study lenses for at least 8 hours a day, 6 days a week;
• •5. Is willing and able to follow instructions and maintain the appointment schedule;
• •6. Habitually wears of toric soft contact lenses binocularly.
• •1. No more than 1/3 of the participants should be wearing daily disposable soft toric lenses;
• •2. the remaining 2/3+ of the participants must be planned frequent replacement soft toric lens wearers as follows:
• •* i. TOTAL30 for Astigmatism: maximum of 3 (∼10%) (no target percentage)
• •* ii. Biofinity toric: maximum of 13 (∼40%) (PLUS a target of minimum 10 (∼30%))
• •* iii. Air Optix for Astigmatism (inclusive of +Hydraglyde): maximum of 10 (∼30%) (PLUS a target of minimum 7 (∼20%))
• •* iv. ULTRA for Astigmatism: maximum of 5 (∼15%) (no target percentage)
• •* v. Acuvue Vita for Astigmatism: maximum of 3 (∼10%) (no target percentage)
• •* vi. Acuvue Oasys for Astigmatism: maximum of 10 (∼30%) (no target percentage)
• •* vii. Other brands of frequent replacement: maximum of 7 (∼20%) (no target percentage)
• •7. Has refractive astigmatism of at least -0.75DC but no more than -2.75DC in each eye that is correctable with a soft toric lens with a cylinder power of no greater than -2.25DC;
• •8. Is ammetropic and requires a spectacle spherical component of +8.00 to -10.00D inclusively;
• •9. Can be fit and achieve binocular distance vision of at least 20/32 Snellen with the available lens parameters