The purpose of this study was to compare the clinical performance of two different reusable lenses in habitual spherical soft lens wearers.

This study was a prospective, bilateral eye, double-masked, randomized, 1 month cross-over, daily-wear design involving two different frequent replacement type lenses. Duration of involvement for each participant was approximately 3 months.

Inclusion Criteria:

1. Were at least 18 years of age and no older than 39 years, and had full legal capacity to volunteer;

2. Had read and signed an information consent letter;

3. Were willing and able to follow instructions and maintain the appointment schedule;

4. Self-reported having had a full eye examination in the previous two years;

5. Had healthy eyes with no health condition or medication that contra-indicate contact lens wear, in the opinion of the investigator;

6. Anticipated being able to wear the study lenses for at least 8 hours a day, 6 days a week;

7. Habitually wore spherical soft contact lenses, for the past 3 months minimum:

   It was preferred that all participants were habitual frequent replacement lens wearers. However, if this was not possible then no more than 5 participants could be habitual daily disposable lens wearers at each site, the rest had to be habitual frequent replacement lens wearers;

   - For the frequent replacement wearers: No more than 3 could be habitual wearers of the Avaira Vitality™/ Serenity™ brand (or their equivalent private label brand name) and no more than 3 could be habitual wearers of AIR OPTIX® plus HydraGlyde® can be enrolled at each site;

8. Had refractive astigmatism no higher than -0.75DC in each eye;

9. Could be fit and achieve binocular distance vision of at least 20/30 Snellen (Available lens parameters are sphere +6.00 to -6.00D, 0.25D steps).

Exclusion Criteria:

1. Were participating in any concurrent clinical or research study;
2. Had any known active ocular disease and/or infection that contraindicated contact lens wear;
3. Had a systemic or ocular condition that in the opinion of the investigator may have affected a study outcome variable;
4. Were using any systemic or topical medications that in the opinion of the investigator may have affect contact lens wear or a study outcome variable;
5. Had known sensitivity to the diagnostic sodium fluorescein used in the study;
6. Self-reported as pregnant, lactating or planning a pregnancy at the time of enrolment;
7. Had undergone refractive error surgery or intraocular surgery.

The duration of the clinical trial, approximately 2-3 months