Contact lens fitting characteristics study

INTERVENTION: Each participant uses all 3 contact lenses in a random order for a 2 hour period, after which the contact lens fitting measurement and comfort measurement are being carried out. 1. Measurement of contact lens decantation (horizontal and vertical) from the centre of the pull (mm). The measurement to be performed in primary gaze and reading gaze. 2. Lens centration and lens movement classification on 5 point scale. 3. Contact lens comfort rating on 100 point VAS scale. CONDITION: Presbyopia multifocal contact lens fitting ; Eye Diseases ; Presbyopia PRIMARY OUTCOME: Contact lens decentration is measured from high speed video taken after 2 h of wear SECONDARY OUTCOME: ; Measured after 2 h of wear:; 1. Lens centration rating on a 5 point scale by investigator using a slit lamp biomicroscope; 2. Lens movement rating on a 5 point scale by investigator using a slit lamp biomicroscope; 2. Comfort rating by participant using a computer based 100 point VAS scale; INCLUSION CRITERIA: 1. At least 40 years old 2. Have read and understood the Participant Information Sheet in English 3. Have read, signed and dated the Informed Consent 4. Best corrected visual acuity of at least 20/25 in each eye 5. Have normal eyes with the exception of the need for visual correction 6. Current contact lens wearer 7. Spectacle refraction: Distance: Sphere: ‐6.00D to + 4.00D Astigmatism: 0.00DC to ‐0.75DC Near Addition: +0.75D to +1.25D 8. Be willing and able to adhere to the instructions set in the clinical protocol and maintain the appointment schedule