UltraVision’s Silicone Hydrogel

Definitive™ SiH material has a unique combination of properties that make it ideal for all types of contact lens wearer.

Moist in the Eye

The high water content of 74% enables the lens to provide a moist environment for the eye.

Retains Moisture All Day

Due to the specific chemical properties of the material, it retains water throughout the day, losing less that 2% of water in a whole day’s normal wear. This enables the contact lens to retain its oxygen permeability (DK/t) at a stable level throughout the day, whilst also providing the user with consistent comfort and optical clarity throughout the day.

Fit Consistent All Day

The fit of the lens remains the same throughout the day as there is no shrinkage or warping due to the excellent water retention of the material.

No Surface Treatment Needed

The Definitive™ material has the water retention properties built into the unique chemistry of the material, and therefore no surface treatment is required. This results in 3 major benefits:
• The lens surface remains consistent and thus the comfort is retained for the life of the lens
• The vision is not degraded by surface damage often experienced with plasma treated lenses
• The wearer can safely use rubbing techniques when cleaning the lens, thus ensuring the best cleaning possible.

More Flexible than Other Silicone Hydrogels

The modulus (stiffness) of the material is very low. This enables the contact lenses to be a soft as a normal soft lens material, be flexible in the eye and hence be more comfortable for longer wearing times.

Excellent Comfort All Day

The combination of high water retention, low modulus and surface wettability makes these lenses exceptionally comfortable. Patients who have worn these lenses in dry conditions, for example in air conditioned offices, have commented on their daylong comfort. They report higher levels of comfort than with most other lenses they have worn.