Corneal and Conjunctival Sensitivity and Staining Study

Fecha de inicio: 1 de marzo de 2007

Inclusion Criteria: An eligible participant is one who: * Is between 17-45 years old and has full legal capacity to volunteer. * Has read and signed an information consent letter, after having the opportunity to ask questions and receive acceptable answers. * Is willing and able to follow instructions and maintain the appointment schedule. * Does not experience any dryness related symptoms during lens wear (i.e. at least 12 hours of comfortable wearing time) * Is correctable to a visual acuity of 6/7.5 (20/25) or better (each eye) with their habitual vision correction. * Has normal binocular vision (no strabismus, no amblyopia). * Has clear corneas and no active ocular disease. * Has had an ocular examination in the last two years. Has a distance contact lens prescription between +0.50D to +6.00 DS and -0.50D and -12.00 DS. * Has astigmatism less than or equal to -1.00DC. * Agrees to wear the study lenses on a daily wear basis. * Has a pair of glasses with updated prescription and agrees to wear them during the period no lens wear (7-10 days) as required by the study. Exclusion Criteria: A person is ineligible if he/she: * Has undergone corneal refractive surgery. * Is aphakic. * Has any active ocular disease. * Has any systemic disease affecting ocular health. * Is using any systemic or topical medications that may affect ocular health. * Has a known sensitivity to the diagnostic pharmaceuticals to be used in the study. * Is pregnant or lactating. * Is participating in any other clinical or research study. * Has a known clinically significant sensitivity to the contact lens care solutions used in the study. * Has ocular or systemic allergies that could adversely affect contact lens wear. * Currently wears lenses on a continuous or extended wear basis. * Has any ocular pathology or severe insufficiency of lacrimal secretion (dry eyes) that would affect the wearing of contact lenses. * Has pinguecula/pterygium that, in the investigator's judgment, makes contact lens wear inadvisable. * Is a rigid lens wearer. * Has corneal staining graded as 2 (macropunctate) or greater in any corneal region in either eye, sum of corneal staining type (severity) of greater than or equal to 4 across the entire cornea in either eye, or any corneal staining covering greater than or equal to 20% in any corneal region in either eye.