Marginal performance of corrected ophthalmic lenses

P 461 Distortion induced by ophthalmic lenses

IZAKI A., SHIMO-OKU M. Deparfment of Ophthalmology, Hyogo College of Medicine (Japan) Puroose : Blink reflexes evoked with comeal sensation or flash light stimulation are widely performed to examine optic, trigeminal and facial nerve. Both the electro-oculographic findings of lid movements and scleral search coil findings of eye movements during those blinks were investigated previously, we stu...

Ophthalmic drug delivery through contact lenses.

PURPOSE Currently available ophthalmic drug delivery systems are inefficient and may lead to side effects. To increase efficiency and reduce side effects, the authors propose disposable particle-laden soft contact lenses for ophthalmic drug delivery. METHODS The essential idea is to encapsulate the ophthalmic drug formulations in nanoparticles and to disperse these drug-laden particles in the...

Berger's Stereoscopic Lenses for Ophthalmic Practice

carrier (Fig. 1) which is attachable to the head by a band or spring-strap: or?still more conveniently?in a special reversible spectacle frame with a high bridge on one side and a low bridge on the other. (Fig2). They were originally designed to replace the single magnifying lens in use in the watchmaking and engraving trades. With a single lens it isobvious that the retinal image of the unused...

Testing for the impact resistance of ophthalmic lenses

Interferometer for measuring power distribution of ophthalmic lenses.

The use of a lateral shear interferometer in measuring the power variation of ophthalmic lenses is described and demonstrated. It is shown that an appropriate lateral shear interferometer directly measures the power variation of an ophthalmic lens. If the ophthalmic lens has a toric surface, the power for each axis can be measured separately. Individual surfaces can be tested, as well as the wh...