Soft Lens Study: Biomedics 1 Day Extra Sphere and Clariti 1 Day Sphere

The aim of this study is to evaluate and compare the performance of a hydrogel lens and a silicone hydrogel lens in existing myopic soft lens wearers.

Inclusion criteria

• Are at least 18 years of age and have full legal capacity to volunteer;
• Have understood and signed an information consent letter;
• Are willing and able to maintain the appointment schedule;
• Are an adapted soft contact lens wearer;
• Have a vertex-corrected contact lens prescription of -1.00DS to -6.00DS (inclusive) in each eye;
• Have a refraction with a cylinder component of no more than -1.00DC in each eye;
• Can be fitted with and achieve a distance visual acuity of +0.10 logMAR or better in each eye with the study contact lenses.

Exclusion criteria

• Are participating in any concurrent clinical or research study;
• Have any known active ocular disease and/or infection or slit lamp findings that would contraindicate contact lens use;
• Have a systemic condition that would contraindicate contact lens use;
• Are using any systemic or topical medications that would contraindicate contact lens use;
• Have known sensitivity to the diagnostic fluorescein sodium to be used in the study;
• Are an employee of the Centre for Ocular Research & Education directly involved in the study (i.e. on the delegation log).