Immobility of a lens on the eye – often observed immediately on eye opening after sleep with silicone hydrogel lenses. Normal movement patterns are gradually established after eye opening so that binding is usually not observed at an aftercare visit. … Continue reading
Evaporation of the pre-lens tear film, consequently causing the lens to lose moisture to the environment. More common with higher water content and ionic lenses. May be related to dryness/discomfort symptoms reported by the patient. Pervaporation of the post-lens tear … Continue reading
Due to the higher rigidity of the new silicone-based materials, most lenses exhibit approximately up to 0.5mm of movement in primary gaze compared with approximately 0.2mm for DSCL.
A vital stain that has a similar action to rose bengal but does not sting on instillation.
Term for contact lenses or contact lens materials with Dk/t between 18 and 25 x 10-9 (cm x ml O2)/(s x ml x mmHg). Also see Dk, Dk/t, Oxygen demand and Oxygen supply.
Unit dose or multi-dose comfort drops formulated for use with contact lenses. Patients should be advised to use lubricating drops often and liberally, especially before bedtime and upon awaking.