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Topic: Bifocals

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	Bifocals - Wikipedia, the free encyclopedia
		Bifocals are eyeglasses that have corrective lenses containing two different lens powers.
		Bifocal lenses are available with the reading segments in a variety of shapes and widths.
		Although most printed reading materials are easily viewed with bifocals, computer monitors are generally placed directly in front of users, but still close enough to require corrective lenses, requiring bifocal wearers to tilt their heads up to view the screen.
	en.wikipedia.org /wiki/Bifocals (192 words)

	Bifocals - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-04)
		They are most commonly prescribed for people with presbyopia, and who also require a distance correction for myopia or hyperopia (and often astigmatism).
		Taking advantage of that fact, he designed bifocals with the lenses for close viewing in the lower half of the frame and the distance viewing lenses on the upper.
		Originally he simply cut each lens in half and combined the separate halves together in the frame, but now most bifocals are made by molding a small reading segment into the lens.
	www.encyclopedia-online.info /Bifocal (275 words)

	Focal Points Bifocals, Trifocals and Progressive-Addition Lenses
		Bifocal, trifocal, and progressive- addition lenses share the common design of correction for distance and near vision in a single lens.
		In the 1950s, the Executive bifocal was developed, in which the front surface of the lens was ground with a smaller radius of curvature in the bottom than the top, causing a line across the lens.
		Flat-top bifocals have minimal image jump, because the optical center of the segment is near the top of the segment.
	www.eyemdny.com /Dr__Wisnicki_-_CV/Publications/Focal_Points/body_focal_points.html (3720 words)

	The College of Optometrists in Vision Development (Site not responding. Last check: 2007-11-04)
		Bifocals are lenses that contain two different prescriptions in the same lens.
		Bifocal lenses for children are available in polycarbonate material, which is an important safety factor.
		The conditions for which bifocals may be prescribed for children include impending or progressing nearsightedness, binocular vision disorders and visual dysfunction associated with desk or computer work.
	www.covd.org /art/bifocals.html (383 words)

	Bifocals and Trifocals: Q and A from Vision World Wide, Inc. (Site not responding. Last check: 2007-11-04)
		Sometimes bifocals are prescribed to improve a child's near vision skills which affect reading and writing, while at the same time, providing clear distance vision.
		Bifocals, or lenses that combine two different powers, are prescribed to aid both near and far vision in one pair of lenses.
		Like bifocals, the top part of the lens is usually for distance vision and the bottom part is for reading.
	www.visionww.org /article-bifocals-trifocals.htm (467 words)

	Bifocals for Children from Vision World Wide, Inc. (Site not responding. Last check: 2007-11-04)
		Bifocals are prescribed for younger people to correct poor visual acuity (clearness of vision) at various distances.
		There are some types of bifocals that gradually change in power from the distance vision segment to the near vision segment, eliminating the telltale line in the middle.
		If the bifocals are prescribed to help a child focus and aim his or her eyes correctly, they may not be needed if these skills improve as the child grows older.
	www.visionww.org /article-bifocals-for-children.htm (505 words)

	Bifocals for Kids - SUNY University Optometric Center - New York
		Bifocals may be recommended to reduce the amount of eye strain during close work which in some cases leads to progressing near-sightedness.
		Bifocals may be helpful for children who have trouble changing their focus when looking from the desk to the flboard and back again.
		Rather, bifocals may be prescribed for your child to provide the ideal correction for both near and far vision in one pair of glasses.
	www.sunyopt.edu /uoc/services/bifocals.html (373 words)

	Consumer Guide to Bifocals: Multifocal and Bifocal Eyeglasses
		Bifocals (meaning a lens with two points of focus — usually one for distance and one for near) are the most commonly prescribed multifocal lenses.
		Similar to bifocals are trifocals, or lenses with three points of focus — usually for distance, intermediate and near.
		One occupational bifocal is a Double-D, which has a half-moon-shaped flat-top bifocal at the bottom of the lens and an upside-down flat-top at the top of the lens.
	www.allaboutvision.com /lenses/multifocal.htm (1070 words)

	Bifocals - Eye on Contacts
		Bifocal contact lenses can also be called segmented contact lenses.
		With bifocal lenses, the top lens portion is used for distance vision, whereas the the bottom portion of the lens is used for near (reading) vision.
		Some bifocals are designed in a similar fashion to bifocal eyeglasses, with the wearer's two different prescriptions divided halfway on the lens.
	www.eyeoncontacts.com /bifocals.html (306 words)

	View Study [NEI Clinical Studies] (Site not responding. Last check: 2007-11-04)
		The apparent effectiveness of bifocals in children with near-point esophoria and the lack of effectiveness in other children may be explained by a greater lag of accommodation in children with esophoria.
		Follow-up was incomplete for six children in the bifocal group and one child in the single-vision group.
		Use of bifocals, instead of single-vision glasses, by children with near-point esophoria appeared to slow myopia progression to a slight degree.
	www.nei.nih.gov /neitrials/viewStudyWeb.aspx?id=27 (1065 words)

	Bifocals Barbie (Site not responding. Last check: 2007-11-04)
		The bifocal form of corrective lens set was popularised in the late eighteenth century by Benjamin Franklin who had grown frustrated at needing two sets ofspectacles to deal with each aspect of the above kind of impaired vision.
		Later examples involved the cementing of a bifocal segment onto a larger lens, but now mostbifocals are made by molding a small reading segment into the lens.
		Although most printed reading materials are easilyviewed with bifocals, computer monitors are generally placed directly in front of users, but still close enough to requirecorrective lenses, requiring bifocal wearers to tilt their heads up to view the screen.
	www.daikaiju.com /edge/33755-bifocalsbarbie.html (647 words)

	bifocals (Site not responding. Last check: 2007-11-04)
		These glasses or spectacles (a term used in the 1700's) are used to correct vision problems…scientifically referred to as errors of refraction in the lens of the eye itself.
		When Benjamin Franklin made these bifocals, his intention was to invent a tool that would enable him to read and do everyday tasks at the same time.
		He was annoyed at having to change his spectacles to best suit the activity he was currently pursuing.
	www.phillyvrtour.org /bifocals.htm (217 words)

	Bifocals: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-04)
		The bifocal form of corrective lens set was popularised in the late eighteenth century by Benjamin Franklin Benjamin Franklin quick summary:
		(the early split 'Franklin' bifocals were designed with the lenses for close viewing in the lower half of the frame and the distance viewing lenses on the upper.
		Later examples involved the cementing of a bifocal segment onto a larger lens, EHandler: no quick summary.
	www.absoluteastronomy.com /encyclopedia/b/bi/bifocals.htm (974 words)

	Bifocals for Children
		Bifocal glasses are used to correct vision at two distances—a prescription on top for far away and a different prescription on the bottom for near.
		When bifocals or reading glasses are prescribed, it is important that children wear them for all close work, especially at school and during homework.
		Bifocals are an important tool for optometrists when working with children who spend up to eight hours a day using their eyes for reading and school work.
	www.childrensvision.com /bifocals.htm (582 words)

	Bifocals consumer guide - bifocal contacts as an alternative to bifocal glasses.
		Bifocals are a solution for people whose eyes are unable to focus on near objects.
		The most successful and popular bifocal contact lens is Acuvue Bifocal.
		Bifocals have some adjustment period, which varies from person to person.
	www.1-contact-lenses-consumer-guide.com /bifocals.html (670 words)

	Laura's Optics Guide: Binoculars with Bifocals
		With practice, it’s easy for eyeglass and even bifocal wearers to use binoculars with your glasses on—after all, you don’t want to miss quick-flying birds in the second or two it takes to remove or push up your glasses.
		Whether you have progressive bifocals or ones with a line, or even if you have trifocals, your eyes will quickly adjust to looking through the glasses and the eyepieces to get a clear look if you match the right binoculars with the right eyewear.
		If you need bifocals, don't wear just distance glasses for birding--you won't be able to take field notes or consult a field guide without the lower bifocal lens.
	www.binoculars.org /birding/Optics/Bifocals.html (695 words)

	Technorati Tag: bifocals (Site not responding. Last check: 2007-11-04)
		Bifocal Reading Glasses Sun and reading bifocals from as low as $8.95.
		Optx 20 20 Press On Bifocal Lenses Optx 20 20, press on, bifocal lenses are an inexpensive alternative to prescription sunglasses and bifocals.
		Bifocals and No-lines - 70% off Retail 39Dollarglasses.com has a gorgeous selection of frames to choose from.
	www.technorati.com /tag/bifocals (485 words)

	Bifocals - Davis Eyecare Associates
		Bifocal is a condition characterized by the inability of seeing adequately at near.
		Those who are presbyopic usually wear bifocals or reading glasses.
		Many patients with bifocals are now wearing contact lenses because research and development have improved bifocal contact
	www.daviseyecare.com /bifocals.html (198 words)

	Bifocals (Site not responding. Last check: 2007-11-04)
		Although over-the-counter reading bifocals glasses will not damage your eyes or your vision, it is. essential that you continue to have your eyes examined regularly to watch for diseases such.
		Q I currently have bifocal lenses which are called blended, which means.
		May 3, 2006, 3 40am font br bifocals bifocalsIndex bqfocals bifocals bifocalw bcfocals bfocals bifocals bifokals bifcals bifacals bifocals bikocals biocals bifocals bifocals bifocal bfocals bijocals bifocals bxfocals blfocals bqfocals.
	bifocals.ectoc.be /index.html (1258 words)

	LiveScience.com - The Future of Glasses: Electronic Bifocals
		Don't throw away those bifocals just yet, but scientists have developed prototype spectacles that change prescriptions with the flick of a switch.
		Doctors commonly prescribe bifocals, which have a small window on the bottom half to correct close-range vision.
		But bifocals can cause eye strain, a wearer has to constantly shift line of sight, and the field of vision is limited.
	www.livescience.com /technology/060404_bifocals.html (447 words)

	Helpful Bifocals information online (Site not responding. Last check: 2007-11-04)
		BIFOCALS FOR CHILDREN Bifocals are lenses that contain two different prescriptions in the same lens.
		In an era of the cellphone camera, the digital camera and the camcorder, many people are moving against the current and commissioning portrait artists to capture their loved ones in oil on canvas for the ages.
		Bifocal contact solutions - Page Excerpt: Have your eyes examined regularly and always follow your eye careprofessional's instructions for the proper use and care of your contact lenses.
	www.1bifocals37.info (809 words)

	Liberty's Kids . Archive . Bifocals (Site not responding. Last check: 2007-11-04)
		Bifocals have divided lenses for clearer distant and near vision.
		The top half of the lens is used to focus on things in the distance, such as across a room or across a street.
		So he cut the lenses of each pair of glasses in half and put a piece of each in a frame and thus, bifocals were invented.
	www.libertyskids.com /arch_what_bifocal.html (112 words)

	Bifocals :: Designer Bifocals
		It all began with Benjamin Franklin bifocals invention, the first pair of glasses of it’s kind that incorporated two different powers in each lens, for near and distance corrections.
		Many online bifocal dealers also offer nutritional supplement information to help prevent eye disorders like “dry eye”, Presbyopia or cataracts in older folks and even find some sites that have pictures of bi focals to help you choose your favorite pair.
		Discount bifocals are available through many merchants on the Internet giving you a break in the wallet as well as the convenience of online shopping.
	www.designer-sun-glasses.org /bifocals.htm (339 words)

	Astromart Articles - Bifocals for Astronomers
		Conventional 2-part bifocals are much better, but they don't mate well with telescope eyepieces.
		I had a special pair of bifocals made with the near-vision segment placed extra low, just for viewing the control box or a small star map.
		They're not just ordinary bifocal lenses set lower in the frame; they're specially ground to put the optical centers of both segments in the right place.
	www.astromart.com /articles/article.asp?article_id=184 (359 words)

	Bye Bye Bifocals
		But now reading glasses, or old-fashioned bifocals, don't seem quite as hip, and many visually impaired people in their 40s are turning to other alternatives, such as bifocal contact lenses or eye surgery.
		For those who don't want to wear traditional bifocals or reading glasses, one available alternative is monovision contact lenses.
		Bifocal contact lenses include two powers in each lens, correcting for both distance and near vision, but many people find it difficult to adjust to them, ophthalmologists say.
	www.webmd.com /content/article/13/1738_50173.htm?lastselectedguid={5FE84E90-BC77-4056-A91C-9531713CA348} (803 words)

	NPR : New Bifocals Activated with Flip of a Switch
		All Things Considered, April 3, 2006 · Benjamin Franklin is generally credited with the invention of bifocals, and the basic technology hasn't much changed for 300 years.
		Traditional bifocal eyeglasses all basically have a lens that's split into two focusing powers: You look through the bottom for reading, and the top for distance.
		The new bifocals were built by a group led by Nasser Peyghambarian at the University of Arizona in Tucson.
	www.npr.org /templates/story/story.php?storyId=5320436&ft=1&f=2 (609 words)

	Bifocals
		What bifocal contact lenses do is provide patients the balance to look at near and far distances with clarity.
		They way bifocals work is, the main part of the lenses will have the prescription for nearsightedness or farsightedness.
		So bifocals or progressive lenses will provide you a great deal of ease as well as convenience for you will be able to carry two prescriptions in only one pair of eyeglasses.
	contact-vision.com /bifocals.html (324 words)

	Mulitfocal Lenses: Bifocals and Trifocals - Eyefinity (Site not responding. Last check: 2007-11-04)
		Bifocals and trifocals have visible lines that separate the different areas of the lens.
		Bifocals: provide two vision zones separated by a visible line.
		Progressives differ from bifocals and trifocals in that the different zones are not separated by visible lines, but rather offer a natural, "progressive", transition between the different powers on the lens.
	www.eyefinity.com /consumer/html/consumer_eyeglasses_a6.htm (399 words)

	Varilux & clinical studies (Site not responding. Last check: 2007-11-04)
		Nearly half (48%) said their bifocals do not provide good vision at all distance.
		With Varilux Comfort, Bifocals wearers reported better near-vision, traditionally an area of strength for bifocals.
		Bifocals wearers are three times more likely to be "very satisfied" with Varilux Comfort than with segmented bifocals.
	www.essilorha.com /question_50.htm (276 words)

	Trifocals (Site not responding. Last check: 2007-11-04)
		Although most bifocals and trifocals have lines, there is a round bifocal...
		Occupational Bifocals and Trifocals for Presbyopia - AllAboutVision.com
		If you have difficulty doing your job because of your bifocals, or find you're getting a stiff neck trying to use the reading portion of the lens all day at work, occupational bifocals (or trifocals) may be just the thing for you.
	trifocals.eyefacts.net (985 words)

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