Both figures show that the centre of the lenses (devoted to far distance) does not reach the nominal distance power of the lens (−3.0 D), being slightly more positive. A higher nominal power of the lenses implies a higher addition, however, this may impact on distance vision. Therefore, this positive over-correction (around 0.5 D) should be taken into consideration by clinicians at the moment o...

BACKGROUND Bandage contact lenses are commonly used by ophthalmic practitioners to protect the patient's cornea. We report a case of folded bandage contact lens retained for six and a half years in the upper subtarsal space. To our knowledge, no other cases of retained bandage contact lens have previously been reported in the literature. CASE PRESENTATION A patient was applied a pair of banda...

acanthamoeba keratitis is a vision- threatening infection and the most important risk factors are contact lenses characteristic symptoms include disproportionately severe ocular pain, epithelial ulcer, ring stromal infiltrate and resistance to antimicrobial treatment. the aim is to report the first cases of acanthamoeba keratitis in yazd in a retrospective study confirmed on histopathological a...

The evolution of pathological changes in the corneal epithelium may be studied by tissue culture methods. We have examined the effects of conventional hard contact lenses and hydrophilic soft lenses, in order to study the effect of the direct pressure of such lenses on the corneal epithelium and the effect of prolonged oxygen deprivation on cell growth. We have also observed the time of onset o...

We demonstrate that a modified point diffraction interferometer can be used to measure the power distribution of different kinds of ophthalmic lenses such as spectacles, rigid and soft contact lenses, progressive lenses, etc. The relationship between the shape of the fringes and the power characteristics of the component being tested is simple and makes the design a very convenient and robust t...

A rapid fluorescent staining method using a tetrazolium dye and propidium iodide for the in-use assessment of disinfection of Pseudomonas aeruginosa biofilms on soft contact lenses showed that 11 to 13% of cells on lenses remained actively respiring and recoverable by culture methods after 30 min of exposure to 3% hydrogen peroxide.

PURPOSE The purpose of the present study was to develop mathematical relationships that allow obtaining equilibrium water content and refractive index of conventional and silicone hydrogel soft contact lenses from refractive index measures obtained with automated refractometry or equilibrium water content measures derived from manual refractometry, respectively. METHODS Twelve HEMA-based hydr...

Supplementary data associated with this article can be 5. Domínguez-Vicent A, Marín-Franch I, Esteve-Taboada JJ, Madri Costa D, Montés-Micó R. Repeatability of in vitro power profi measurements for multifocal contact lenses. Cont Lens Anteri Eye. 2015;38:168--172. 6. Kim E, Bakaraju RC, Ehrmann K. Power profiles of commerci multifocal soft contact lenses. Optom Vis Sci. 2016. Post Auth Correcti...

BACKGROUND Most corneal damage induced by contact lenses is due to interference with corneal oxygenation. OBJECTIVE To investigate the effect on the rabbit cornea of a rigid gas-permeable contact lens with a newly designed periphery. METHOD We fitted New Zealand white rabbits (n = 12) with RGP contact lenses that were identical in all respects except for the design of the periphery. In each...

PURPOSE To evaluate the effect of soft contact lens type on the in vivo tear film surface quality (TFSQ) on daily disposable lenses and to establish whether two recently developed techniques for noninvasive measurement of TFSQ can distinguish between different contact lens types. METHODS Thirteen subjects wearing four different types of daily soft contact lenses participated in the study. Dyn...