দ্বিকেন্দ্রী
(1) Having two foci
(1) There is no one u251cu00f6u251cu00e7u251cu2510bestu251cu00f6u251cu00e7u251cu00fb soft bifocal contact lens.
(2) Alternatively, some people use varifocal or bifocal lenses in order to see objects clearly that are both close up and far away.
(3) People with bifocal glasses are especially prone to neck aches because they may have to tilt their heads back to see things up close.
(4) The teacher was a cheery middle-aged woman with black hair and rather thick bifocal glasses.
(5) This restricted the movement of her head which reduced her ability to use her bifocal glasses.
(6) Two developments, bifocal lenses and better spectacle frames, helped move optometry from a vendor trade toward a recognized profession by making fitting and selecting eyeglasses more complicated.
(7) He wears bifocal glasses with gold rims and a black-faced watch.
(8) The multiple vision lenses include bifocal lenses for near and distant vision.
(9) Three different designs for bifocal contact lenses exist: simultaneous, concentric and alternating vision.
(10) But they also have a bifocal segment in the lower quadrant of the lens that lets us find the correction needed to bring the front sight into focus.
(11) Accommodative effort and retinal blur can be minimised by bifocal glasses, which change the focal point for near work.
(12) Back home, he made one more great contribution to human felicity: bifocal glasses.
(13) A friend told us this company was going to revolutionise bifocal contact lenses.
(14) Bifocal contact lenses, like bifocal glasses, provide distance and close-up correction on each contact.
(15) Most people can't see a crisp 20/20 at near or far distances with our current generation of bifocal contact lenses.
(16) Bifocal contact lenses to correct distance and reading vision, so that the obvious bifocal glasses with their ageing implications could be avoided, have not proved successful.
(17) Soft lenses for daily wear have a very short adaptation period and are available in various tints and bifocal designs.
(18) Without bifocal vision, he lacked depth perception and couldn't tell how far ahead of him horses were.
(19) Bifocal lenses with separate fields for near and far vision, working in much the same way as bifocal spectacles, have been available since the early 1990s, but these still provide optimal vision only at two fixed distances.
(20) Therefore, a bifocal relay mirror effectively puts the laser source at the mirror.
bifocal