TH18364C3 - Progressive multi-focus contact lenses suitable for compensating farsightedness. - Google Patents

Abstract

DC60 (23/02/42) The optical power progression of the lens consists of a phase one (a), which is rapidly degraded to the light at the base. And which the lens serves for myopia, the short second period (b), which remains at the level of the refractive power at the base. True and which lenses will serve for presbyopia, and the third (c) range consists of The first (c ') and the second constant (c' '), progressive segments, and to which the lens faces Progressive For medium spacing in the first part And in a constant manner for Myopia in the second part (Fig. 2), the optical power progression of the lens is composed of a phase one (a) which is rapidly degraded to the light at the base. And which the lens serves for myopia, the short second period (b), which remains at the level of the refractive power at the base. True and which lenses will serve for presbyopia, and the third (c) range consists of Progressive increments first (c ') and constant second parts. (c '') and which lens will face Progressive For medium spacing in the first part And in a constant manner for Myopia in the second part (Fig. 2).

Claims (3)

1. Progressive Multifocal (1) Contact Lenses Suitable for Compensation. Farsightedness, which has the characteristics that The power of the light zone is continuously proportional to the refraction power at the base between the center of the lens and the periphery of the light zone according to the progression shown: Center value From this section the first (a) deflects, rapidly descending to the refraction at the base, and along this line the lens acts. For myopia - the second period that is moderate. (b) that is truly parallel to the horizontal coordinate at the value of the refractive power at the base and along this line, the lens serves for Presbyopia - Peripheral third (c) period consisting of The first part is progressively added (c \ ') and the second (c \' \ ') parallel to the horizontal coordinate. Where such two parts (c \ ', c \' \ ') correspond to the power, which the lens acts progressive for the short distance. Middle in first part And in a constant manner for myopia in the second part 2. Progressive Multifocal Contact Lenses According to claim 1, there is a special characteristic that - period one (a) has a peak at the center of the lens The saddle is up to approximately 6 units of refractive power of the lens. This is often reduced to a value equal to 0, the refractive power of the lens. Which is equivalent to the refractive power at the base at a distance from the center of the lens This may range from 0.5 to 1.5 mm - the second range (b) is parallel to the horizontal coordinate at a level equal to 0, the refracting power of the lens and is virtually constant from the lowest point of the first range. (a) to the point where the insertion Harmonized with the lower end of the third (c) - The third (c) consists of i) the first segment (c \ '), which is progressively elevated from that corresponding point to the point where it is positioned. At the distance from the center of the lens between 2.5 and 3.5 mm and at the refractive power consisting of between 0.5 and 5.0 ii) the second part (c "), which will remain virtually constant at that value of the refractive power at It consists of a distance of 0.5 and 5.0 for the total extension of the optical zone of the lens from the above distances. From the center of the lens between 2.5 and 3.5 mm straight through to the circumference of the optical zone.