Abstract: A color filtering device for a charge-coupled photoelectric converting device including a series of uniformly configured photoelectric converting elements which are sensitized by the filtering arrangement in the order of green, blue, green and red. The filtering arrangement includes a transparent filter carrier supporting a series of green, blue, green, red, blue, green, and so on, filtering elements. The active surface of each blue filtering element is equal to the active surface of the assigned photoelectric converting element. The green and red filtering elements are reduced in size in inverse proportion to the spectral sensitivity of the assigned photoelectric converting element. The resulting spacings between the elements are covered by an opaque masking layer, preferably of chromium.

Abstract: A contact lens has a concave surface which is adapted to contact the cornea of an eye and a convex surface which is adapted to contact the eyelid. At least the convex surface of the lens possesses hydrophilic characteristics although the concave surface of the lens preferably possesses such characteristics also. In any event, the convex surface of the lens has a greater wettability than the concave surface thereof. The more highly hydrophilic character of the convex surface prevents the deposition thereon of fatty substances carried by the tear fluid which may cause opacity of the lens. The less highly hydrophilic character of the concave surface decreases the forces responsible for maintaining the lens in position in the eye, although not to such an extent that the lens does not remain properly positioned.

Abstract: An article composed of a silicon elastomer and which includes activated silicon dioxide as a filler is subjected to ion bombardment. The nature and energy of the ions are such that certain regions of the outer silicone elastomer layers of the articles are destroyed while, at the same time, the silicon dioxide filler is exposed at these regions. The nature and energy of the ions are also such that the remaining regions of the outer silicon elastomer layers of the article are transformed into activated silicon dioxide. As a result, the surface of the article becomes hydrophilic. The effects achieved are due to rupture of the silicon-oxygen and/or silicon-carbon bonds of the silicon elastomer during the ion bombardment, that is, the kinetic energy of the ions is sufficient to break these bonds. The ions used are activated gas ions formed by gaseous discharge and the ions generally have a kinetic energy between 3 and 50 electron volts. Preferably, oxygen ions are utilized for the ion bombardment.

Abstract: Optical wedge filter comprising a coloured gelatine layer on a flexible transparent support and a flexible transparent covering foil bonded the gelatine layer wherein the thickness of the coloured gelatine layer increases stepwise or continuously.