AIM To determine the effect of pH, osmolality, and buffering system on the oxygen permeability (Dk) of soft contact lenses. METHODS Two hydrogel lenses (nelfilcon A and etafilcon A) and 2 silicone hydrogel lenses (lotrafilcon A and balafilcon A) were used in the study. These lenses were incubated in phosphate-buffered saline (PBS) and borate-buffered saline (BBS) solutions adjusted by 0.8 pH ...

PURPOSE A method to measure the tear film beneath a soft contact lens, referred to as post-lens tear thickness (PLTT), would have many applications to contact lens research. In this study a noninvasive technique for measuring the PLTT is presented. METHODS The feasibility of measuring the tear layer by optical pachometry was first assessed using a model eye. The baseline corneal thickness (B)...

Contact lenses are a successful form of vision correction. But their use has been associated with an increased risk of microbial keratitis (MK), contact lens related acute red eye (CLARE) as well as contact lens peripheral ulcer (CLPU) (Eltis, 2011). One of the main problems associated with contact lenses is microbial contamination of the lens surface. Microbial contamination further leads to t...

Brane world cosmologies seem to provide an alternative explanation for the present accelerated stage of the Universe with no need to invoke either a cosmological constant or an exotic quintessence component. In this paper we investigate statistical properties of gravitational lenses for some particular scenarios based on this large scale modification of gravity. We show that a large class of su...

PURPOSE To understand the potential barriers, motivators and enablers in dispensing multifocal contact lenses (MFCL). METHOD Two focus group discussions were conducted to design questionnaires regarding the prescribing habits for multifocal contact lenses (MFCL). Questions on potential barriers and motivators were included. The questionnaires were distributed among 133 eye care practitioners ...