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Topic: Lenses

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	Lens (optics) - Wikipedia, the free encyclopedia
		Lenses do not form perfect images, and there is always some degree of distortion or aberration introduced by the lens which causes the image to be an imperfect replica of the object.
		Lenses in which closer-to-ideal, non-spherical surfaces are used are called aspheric lenses, which are complex to make and often extremely expensive.
		One important use of lenses is as a prosthetic for the correction of visual impairments such as myopia, hyperopia, presbyopia, and astigmatism.
	en.wikipedia.org /wiki/Lens_(optics) (1970 words)

	Contact Lenses- Health Encyclopedia and Reference
		Contact lenses are small, thin plastic disks that are designed to rest on the cornea - the clear front surface of the eye.
		Lenses can irritate the eye because of dryness due to problems with tear production, which may be inadequate, especially in older people.
		A common problem that sometimes occurs with soft lenses is that people develop sensitivity of the eyes and lids, either to the maintenance solutions or to mucus forming on the lens surface itself.
	www.healthcentral.com /encyclopedia/408/346/Contact_Lenses.html (1152 words)

	LENSES (Site not responding. Last check: 2007-11-07)
		Polycarbonate lenses are the most impact resistant lenses available and are always the lens of choice for young people, one-eyed persons and active people.
		These lenses are available in all materials and are becoming the lens of first choice for bifocal and trifocal wearers.
		Aspheric lenses are often made of high index or polycarbonate materials for the ultimate in thin lenses.
	eyedocs.us /ahog/id14.html (949 words)

	Canon EOS Beginners' FAQ III - Lenses (Site not responding. Last check: 2007-11-07)
		Canon sell a number of lenses in a special series they refer to as L for “luxury.” These are their most expensive and highest-quality lenses, and are readily identifiable by the red stripe painted around the end of the barrel.
		All L series lenses are easily identifiable by the red ring painted around the end of the barrel and the letter L at the end of their technical designations.
		And mirror lenses with focal lengths of 500mm to 1000mm are not uncommon.
	photonotes.org /articles/beginner-faq/lenses.html (15132 words)

	Encyclopedia - Contact Lenses
		Contact lenses are now available for the correction of most vision problems caused by refractive defects of the eye including nearsightedness, farsightedness, astigmatism, and presbyopia.
		Contact lenses were first described and sketched by Leonardo da Vinci in the early 1500s, and the first workable model - a 1/4-inch-long glass tube filled with water and containing a microscopic lens - was developed and used by Thomas Young in 1801.
		Contact lenses were made an official part of the practice of optometry in 1945 when the American Optometric Association formally recognized contact lens fitting as an integral part of their profession.
	www.visionrx.com /library/enc/enc_conlens.asp (956 words)

	Contact lenses
		Contact lenses are small plastic disks, shaped to correct a refractive error such as nearsightedness, farsightedness, or astigmatism.
		With most hard contact lenses, there will be a 2- to 4-week break-in period during which you wear the lenses for increasingly longer periods of time each day.
		Contact lenses may be used by people who have had surgery for cataracts, in which the natural lens of the eye is removed.
	my.webmd.com /hw/health_guide_atoz/aa126875.asp?z=4051_00000_7000_nv_07 (1265 words)

	HON: Vision and Eyecare FAQ: section3
		Lenses may be thicker in one meridian or have modified thickness profiles to enable the lens to maintain correct orientation on the eye.
		Lenses are generally sold in a "blister" combination pack, eg 3 months supply with intention that lenses are "disposed" of at the end of the time period.
		Lenses are also often larger in diameter than PMMA to increase the comfort of wearing the lens.
	www.hon.ch /Library/Theme/VisionFaq/section3.html (1511 words)

	Lenses \| Blur, Focus, Bokeh, Aperatures and f-Stops.
		Because a pinhole camera lens operates with so little light, it cannot allow to pass through itself a quantity of rays sufficient to compete with much ambient light at all, and if it is to project a discernable image onto film, it must operate in a light-tight camera and with relatively long exposure times.
		People associate distortion with wide-angle lenses because such lenses are commonly used to pleasingly frame close objects.
		People associate flatness with telephoto lenses because such lenses are commonly used to pleasingly frame distant objects.
	www.digitalartform.com /lenses.htm (1200 words)

	Nikon Nikkor Lenses
		Lenses that get good reviews here prove that the design is good, but that's no guarantee that the one you buy will be any good.
		Popular 28 - 200 mm lenses aren't useful as a do-everything lens on digital since they only start at the equivalent of 43mm, and no, there are no equivalents for digital yet.
		Also fixed lenses are easier to focus manually, since zoom lenses focused manually usually focus too slowly at wide and too fast at tele.
	www.kenrockwell.com /nikon/nikkor.htm (4510 words)

	european contact lenses (Site not responding. Last check: 2007-11-07)
		The hassle of taking out and cleaning contact lenses could soon be over for millions of people around the world, according to scientists.
		Contact lenses are thin, finely crafted plastic discs designed to fit over the cornea (See Anatomy of the Eye) of the eye, usually to correct vision problems caused by refractive error.
		Contact lenses were first described and sketched by Leonardo da Vinci in the early...
	www.contact-lens-shopper.com /european-contact-lenses (880 words)

	Physics 20 - Optics - Lenses
		The rules for drawing ray diagrams for converging and diverging lenses can be used to determine the characteristics of an image formed by a lens.
		Lenses are used in many different kinds of practical applications.
		Recognize that, even though light rays are refracted at both surfaces by a lens, for thin lenses the incident rays can be shown refracting at the construction line passing through the optical centre of the lens.
	www.sasked.gov.sk.ca /docs/physics/u6b2phy.html (1343 words)

	The Anatomy of a Lens
		Lenses can be thought of as a series of tiny refracting lenses, each of which refracts light to produce their own image.
		Lenses differ from one another in terms of their shape and the materials from which they are made.
		Diverging lenses can also be identified by their shape; they are thinner across their middle and thicker at their upper and lower edges.
	www.glenbrook.k12.il.us /gbssci/phys/Class/refrn/u14l5a.html (760 words)

	Aspherical Lenses
		Sometimes, these advertisements can make public look suspiciously at their current lenses in the camera bag and generate a uneasy feeling of owning some inferior quality lenses which are without an aspherical lens elements.
		But since with the wide acceptance and popularity of zoom lenses by many serious SLR users nowadays, you will be rest assured that new generation of aspherical zoom and prime lenses will be coming in with more "varieties" and economically - in a grand scale.
		No necessity We have forgotten those older SLR lenses that were out there since the late '50 have produced millions of faithful, good and stunning images that has impressed all of us and there is absolutely no hurry to change unless you have lost, spoilt or damaged yours and looking for a fresh replacement.
	www.mir.com.my /rb/photography/opinion/html/aspherical.htm (1135 words)

	CONTACT LENSES (Site not responding. Last check: 2007-11-07)
		Are lenses which are worn daily and last for a period of 2 weeks only.
		These Lenses are made by Johnson & Johnson and called ACUVUE and from Hydron ACTIFRESH.
		The lenses however must be cleaned and disinfected daily with a suitable Solution like Optifree, or Complete.
	www.zibycom.com /members/002234700/site1/index3.html (233 words)

	Ancient Greek Lenses?? ?
		Ancient lenses tended to be of rock crystal until Carthaginian and Roman times, beginning about the 4th century BC, after which glass lenses became more common (being much cheaper), and crystal lenses then became rare.
		Schliemann excavated about 48 crystal lenses at Troy, but these all disappeared during the Second World War, and all that remained were catalogue descriptions and a single photo of four of the lenses in a group.
		I tried for many years to find these missing lenses, and a friend who various times approached the museum in East Berlin where the lenses were last known to have been stored was repeatedly lied to and told that the lenses had ‘been destroyed by Allied bombing in the War’.
	www.mlahanas.de /Greeks/Lenses.htm (1235 words)

	CLMA - Frequently Asked Questions About Contact Lenses
		When your eye care professional prescribes contact lenses and you follow all prescribed steps for inserting, removing and caring for them, contact lenses have proven to be a safe and effective vision correction device for millions of people.
		In fact, contact lenses have frequently been used in premature infants who often have underdeveloped retinae at birth and are at risk of blindness.
		GP lenses correct this astigmatism when it is created by a difference in the horizontal and vertical curvatures of the cornea.
	www.clma.net /wearers_FAQ.htm (1105 words)

	Lens Evaluations
		Many lenses, and Nikkors are no exection here, turn in a disappointing performance when they are mounted on tripods because their collars are too small, too weak, or both.
		Many lenses exist in both AI and AIS versions without any change in their optical formula, or the older lens may be in some respects function better.
		However, AI lenses often have a somewhat stiffer focusing feeling to them, which may or may be not desirable.
	www.naturfotograf.com /lens_surv.html (2540 words)

	Contact Lenses
		Soft lenses conform to the shape of the eye, are larger in diameter and are tucked under the eyelids, so they usually don't move out of place or fall out.
		The price of contact lenses is comparable to that of an average pair of eyeglasses, often less than many of today's "designer" frames alone -- and that is without the lenses for the frames.
		Wearing lenses is the best way to find out if you and contact lenses were made for each other.
	www.coolnurse.com /contacts.htm (699 words)

	Lenses - Tetra 5000 Underwater Camera Housing for Nikon Coolpix 5000, Light & Motion Underwater Camera Housing , ...
		The Tetra 5000 ships with a bayonet glass flat port, but you can upgrade to a variety of lens options including the all new Wetmate lens series.Wetmate lenses provide the flexibility of underwater lens changes, so you'll never end up with the right subject and the wrong lens again.
		If you are on a little more of a budget and don't need the flexibility of underwater lens changes, then go with either of our standard macro or wide angle accessory lenses.
		Wetmate lenses provide the flexibility of underwater lens changes, so you'll never end up with the right subject and the wrong lens again.
	www.uwimaging.com /products/photo_housings/tetra5000/lenses.htm (185 words)

	Amazon.com: Books: Canon Lenses (Magic Lantern Guides) (Site not responding. Last check: 2007-11-07)
		Neither however necessarily favors fixed focal length lenses over zoom lenses and both are sensitive to tradeoffs of price, weight, speed, and context of use.
		Their assessments are tempered by practicalities; inasmuch as hikers, backpackers, or travelers have limited space and weight budgets: it may be preferable to carry one zoom to several fixed focal length lenses.
		Lenses are discussed individually; a photo shows fine detail on the lens; and each lens is accompanied by a chart that usefully tabulates properties such as lens construction, length, weight, etc. Extenders and macro lens accessories are also treated.
	www.amazon.com /exec/obidos/tg/detail/-/1883403162?v=glance (604 words)

	Leica Screw Mount Lenses
		All lenses are coated, with good hard coatings and generally have very little trouble with optics or coating.
		Early M lenses were Screw mounts with an adapter so they could be used on either series of cameras.
		As a rule of thumb, earlier lenses up to the mid 50's are of heavier chrome construction, later lenses are fl and are considerably lighter.
	www.cameraquest.com /ltmlens.htm (4270 words)

	Tamron Lenses, 35mm, Digital Lenses, Commack NY
		Our high magnification zoom lenses, which are said to be particularly challenging technically, have received critical acclaim internationally for their innovative technology and have been selected for many prestigious awards.
		Tamron's technical excellence has also been recognized worldwide for macro lenses, wide angle lenses and telephoto lenses.
		And our new line of Di lenses for superior performance with digital SLR cameras, is garnering attention and awards from around the globe.
	www.tamron.com /lenses (97 words)

	Lenses - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-11-07)
		The New Nikon Compendium : Cameras, Lenses & Accessories since 1917 (A Lark Photography Book)
		Lenses and Waves : Christiaan Huygens and the Mathematical Science of Optics in the Seventeenth Century (Archimedes)
		Theories of the Policy Process (Theoretical Lenses on Public Policy)
	encyclopedia.worldsearch.com /lenses.htm (114 words)

	The Mathematics of Lenses
		The use of these diagrams were demonstrated earlier in Lesson 5 for both converging and diverging lenses.
		Diverging lenses always produce images which are upright, virtual, reduced in size, and located on the object's side of the lens.
		The sign conventions for the given quantities in the lens equation and magnification equations are as follows:
	www.glenbrook.k12.il.us /gbssci/phys/Class/refrn/u14l5f.html (1625 words)

	Transitions® - Healthy sight in every light TM (Site not responding. Last check: 2007-11-07)
		The premium variable tint lenses are state of the art and provide healthy vision by blocking harmful UVA and UVB rays.
		Transitions Lenses, through their variable tint lenses, achieve healthy vision for their customers by using proprietary technology.
		Transitions lenses are photochromic or photochromatic lenses, meaning they change color in light.
	www.transitions.com /transmain/main.asp (176 words)

	Contact Lenses at 1-800 CONTACTS \| World's Largest Contact Lens Store®
		We don't sell a myriad of other products; we just focus on contact lenses and strive to be the best at it.
		The Highest Quality Lenses - 1-800 CONTACTS' customers receive the exact same contact lenses as they do from their eye care provider, including all of the major brands like Acuvue, Optima, Focus, Freshlook, Soflens and Biomedics, as well as hard-to-find specialty lenses such as toric contact lenses, colored contacts, bifocal contacts, and multifocal lenses.
		No one is more likely to have your lenses in stock and ready to ship.
	www.1800contacts.com (362 words)

	Contact Lenses - Buy Online and Save Money
		For most people, these tiny lenses are more an approach to better looking, a way to make people more pretty, and even for convienence.
		Because they are no more expensive and taking care of these lenses is so tedious, cheap discount disposable contact lenses are invented so that the only thing you need to do is to replace with another new pair of contact lens.
		Although cataract is the leading cause of visual impairment in the Hispanic community, there has been little research on the prevalence of cataract, cataract surgery or factors that may affect whether Hispanic individuals are able to obtain cataract surgery, according to background information in the article...
	www.1stop-contact-lenses.com (1543 words)

	Special Lenses selected
		Like cars, lenses come in varying shapes and sizes to cater to different applications, but not all are built equally.
		The following is a collection of exotic and hard-to-find lenses or "dream stuff" or even some "ET" models as one would call them.
		Please don't feel bad for most of the lenses featured here are of German origin (but can't denied the fact, they do produce great lenses), may be you can help me to beef up the content part - I am more than willing to do so.
	mir.com.my /rb/photography/hardwares/speciallenses (378 words)

	COASTALCONTACTS â“ SAVE UP TO 70% on Contact Lens and Contact Lenses
		Buy contact lenses from Coastal Contacts and receive the lowest prices guaranteed and free shipping*.
		Have your eyes examined regularly and always follow your eye care professional's instructions for the proper use and care of your contact lenses.
		If you experience any pain or discomfort from your contact lenses, remove them immediately and consult your eye care professional.
	www.coastalcontacts.com (115 words)

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