Presby Corp ., a tiny biotechnology company in Dallas, is developing a plastic implant that would eliminate the need for reading glasses and bifocal lenses.
12.
He developed methods to alter the spherical or cylindrical powers of the lenses which in turn he applied in the process for making bifocal lenses.
13.
The panel recommended the lenses with the condition that they be marketed as a bifocal lens as opposed to a multifocal lens as the company proposed.
14.
And all nearsighted patients will have to take their glasses off to see near or use a bifocal lens in which the bottom part is nonprescription.
15.
In such cases an additional hyperopic correction is often prescribed in the form of bifocal lenses, to reduce the degree of accommodation, and hence convergence, being exerted.
16.
If distant vision must be clear while working at the computer, a bifocal lens with the upper part adjusted for distance and a large bottom section for the computer is recommended.
17.
If you do not have to see distant objects clearly while at the computer, a bifocal lens with the top adjusted for the computer screen and the bottom for reading is ideal.
18.
That predilection, along with a rising preference for colored and bifocal lenses that Bausch does not make, have cut into Bausch's contact lens business, too, putting pressure on another quarter of the company's sales.
19.
The latest from novelist ( " Headlong " ) and playwright ( " Copenhagen " ) Michael Frayn is the melancholy tale of Stephen Wheatley, looking back at his childhood in wartime London through the bifocal lens of an aging man and the boy he once was.
20.
So while for Varilux the surface structure was close to the characteristics of the bifocal lens, with an upper aberration-free half of the surface for far vision and a rather large " segment " for clear near vision, Varilux 2 was distinguished by a totally aspheric design.
