Clinical Evaluation of HPT Treated Rigid Contact Lenses Made From Hexafocon A

Inclusion Criteria: * Willing and able to sign the informed consent form * Aged ≥18 years old * Experienced wearer of rigid gas permeable contact lenses * Subject's habitual contact lenses must be made of Boston XO (hexafocon A) material * Subjects must have owned spectacles or contact lenses prior to enrolment for this trial * Spherical power between -10.00 D and +10.00 D (at vertex distance 0 mm) * Corneal astigmatism ≤2.00 D Exclusion Criteria: * Eye injury or surgery within 3 months immediately prior to enrolment for this trial * Pre-existing ocular irritation that would preclude contact lens fitting * Currently enrolled in an ophthalmic clinical trial * Evidence of systemic or ocular abnormality, infection or disease which is likely to affect successful wear of contact lenses or use of the accessory solutions, as determined by the investigator * Any use of medications for which contact lens wear could be contradicted, as determined by the investigator * Current extended-wear users (sleep-in overnight) * Current monovision lens wearers * Current wearers of multifocal contact lenses * Current wearers of toric contact lenses (front surface design) * Current wearers of astigmatic contact lenses (posterior surface design) * Has a reported "Strong" comfort or vision preference between each eye with their habitual RGP lenses * Unacceptable fit of habitual lenses * Pregnant women and nursing mothers * Best-corrected visual acuity worse than 6/9 (LogMAR: +0.20; Snellen decimal: 0.63)