Paraperm EW lens for extended wear

Area of Science:

• Ophthalmology
• Biomaterials Science

Background:

• Rigid gas permeable (RGP) lenses are used for vision correction.
• Extended wear contact lenses require materials with high oxygen permeability.

Purpose of the Study:

• To evaluate the safety and efficacy of the Paraperm EW rigid gas permeable lens for extended wear.
• To assess visual acuity and complication rates associated with this lens material.

Main Methods:

• A prospective study involving 372 patients fitted with Paraperm EW lenses.
• Data collection on visual acuity and adverse events over a 1-year period.
• Analysis of lens material properties, including oxygen permeability (Dk).

Main Results:

• 94.8% of 270 completers achieved 20/25 or better vision after 1 year.
• Low incidence of complications: superficial limbal keratitis (12.3%), conjunctival injection (3.1%), and corneal edema (1.5%).
• The Paraperm EW lens material demonstrated an oxygen permeability (Dk) of 56 X 10(-11) at 37°C.

Conclusions:

• The Paraperm EW rigid gas permeable lens is a viable option for extended wear.
• It provides high visual acuity with a generally favorable safety profile.
• This lens expands options for patients seeking extended or occasional overnight contact lens wear.