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New shape of a videokeratometric illuminator

100%

Siedlecki D. , Kasprzak H.

tom Vol. 32, nr 4

665-672

The aim of this paper is to define such shape of a videokeratometric Placido disc-based illuminator that would guarantee flat image formation and, consequently, sharp and reliable information an corneal geometry. It is especially important for contact lens fitting to have reliable corneal data in a corneal peripheral area. It has been proved that shape of this stimulator profile depends on assumed corneal geometry. The ellipsoidal corneal shape has been assumed. The results show that the surface on which Placido rings are painted should have a cigar-like shape. Probably none of the devices used currently in clinical practice have such shape.

Measurement of oxygen permeability of contact lenses based on analysis of porosity

80%

Lewandowska M. , Jasińska-Kwaśnik W. , Jóźwik A. , Siedlecki D.

tom Vol. 3, no. 1

1--5

Oxygen permeability seems to be the most important parameter characterize the contact lens. Lenses, which permeable more oxygen to the cornea are safer, reduce the risk of infection and provide greater comfort of wearing. Oxygen permeability of contact lenses might be calculated by analysis of porosity of its surface. With using special program the size and number of pores on definite area was calculated and dependence of permeability and hydration on porosity were established.