Fitting Evaluation of Hydrogel and Silicone Hydrogel Spherical Contact Lenses

This will be a randomized, double-masked, crossover, bilateral non-dispensing study, controlled by cross-comparison. Forty subjects will wear each lens brand for approximately one hour, on three separate study days in random order. Lenses will only be worn during study visits.

Inclusion criteria

• They are of aged 18-40 and have capacity to volunteer.
• They understand their rights as a research subject and are willing and able to sign a Statement of Informed Consent.
• They are willing and able to follow the protocol.
• They agree not to participate in other clinical research for the duration of this study.
• They have a contact lens spherical prescription between -1.00 to - 6.00D (inclusive)
• They have a spectacle cylindrical correction of -0.75D or less in each eye (based on the ocular refraction).
• They can attain at least 0.10 logMAR distance high contrast visual acuity in each eye with the study lenses within the available power range.
• They currently use soft contact lenses or have done so in the previous six months.

Exclusion criteria

• They have an ocular disorder which would normally contra-indicate contact lens wear.
• They have a systemic disorder which would normally contra-indicate contact lens wear.
• They are using any topical medication such as eye drops or ointment.
• They have had cataract surgery.
• They have had corneal refractive surgery.
• They have any corneal distortion resulting from previous hard or rigid lens wear or have keratoconus.
• They are pregnant or lactating.
• They have any ocular abnormality which would, in the opinion of the investigator, normally contraindicate contact lens wear.
• They have any infectious disease which would, in the opinion of the investigator, contraindicate contact lens wear or pose a risk to study personnel; or they have any immunosuppressive disease (e.g. HIV), or a history of anaphylaxis or severe allergic reaction.
• They have taken part in any other contact lens or care solution clinical trial or research, within two weeks prior to starting this study.