PURPOSE Tear exchange under a soft contact lens is directly related to the amount of lateral and transverse lens motion. Hydrodynamic modeling suggests that channels placed on the back surface of a soft lens will reduce fluid resistance and increase transverse lens movement. This study measured the effect of posterior lens surface scalloped channels on tear exchange. METHODS Tear exchange in ...

Contact lens-related eye infections, which can lead to serious outcomes, including blindness, are associated with several risk factors, including sleeping in lenses, exposing lenses to water, not adhering to replacement schedules, and reusing disinfecting solution (1). In some studies, adolescent and young adult contact lens wearers have been reported to be more likely than older adult contact ...

The use of hydrophilic contact lenses has recently been recommended in a variety of pathological conditions. The results have so far been encouraging, but large series with reports of complications as well as of success rates have not yet appeared. The following case represents an instance of corneal abscess caused by a usually nonpathogenic organism in association with the use of a soft contac...

Customized contact lenses are limited in their correction performance, especially on irregular corneas, owing to decentration and rotation of the lenses. To overcome this limitation, we proposed to customize the back surface of soft contact lenses to match the anterior irregular corneal surface. These lenses were designed to correct anterior corneal aberrations and to improve lens stability. Al...

The use of hydrophilic soft contact lenses for dispensation of pilocarpine is described. The release rate of pilocarpine from three materials of different water content was estimated and from this the surface concentrations were calculated. It is estimated that PolyHEMA can after 15 hours provide a 1 per cent surface concentration of pilocarpine, whereas higher water content materials (70 and 8...

OBJECTIVE To evaluate the specific contact lens-related or other factors that may contribute to the outbreak of Fusarium keratitis. METHODS A case-control study was conducted of Fusarium keratitis in contact lens users in Singapore from March 1, 2005, to May 31, 2006, and included 61 patients with Fusarium keratitis and 188 population-based and 179 hospital-based control subjects. Interviewer...

The knowledge related to contact lens wear and practice care of contact lenses among medical students of University of Malaya was assessed through a structured questionnaire. One hundred and twenty-one contact lens wearers participated in this study. Majority of contact lens wearers were females (106, 87.6%); the duration of contact lens wear varied from less than six months to two years or mor...

this study compared tear function tests and cytologic changes on the conjunctival surface in asymptomatic patients wearing contact lens of different materials. included in this study were 40 eyes wearing daily wear 4 week replacement hydrogel (h) lenses, 32 eyes wearing silicone hydrogel (sih) lenses, 18 eyes wearing rigid gas-permeable (rgp) lenses, and 21 healthy eyes (no lenses) as the contr...

PURPOSE To evaluate clinical characteristics, risk factors, management and outcome of contact lens induced keratitis (CLIK) associated with contact lens wear. METHODS The study comprised all consecutive patients presenting with contact lens related presumed microbial keratitis during a 12-month period at our department. Detailed demographic data, type of contact lens, duration of lens wear, w...

PURPOSE This study is a cross-sectional analysis of the types and prevalence of contact lens (CL)-related complications among CL wearing patients seen in a university clinic setting. METHODS Data on CL material and design, care system, and ocular complications were recorded and statistically analyzed for CL wearers. RESULTS Of the 572 patients (846 eyes) recruited during the study, approxim...