Vision Information
FreeVisionInfo.com is an online resource for vision information covering everything from eye care to eyewear. Our goal is to help people become more knowledgeable about eye health, vision, and all things optical so that they can make better informed decisions as patients and consumers about eye care issues. Our database of vision resources and articles is doctor reviewed, updated daily, and always growing.
Around 1284 in Italy, Salvino D'Armate is credited with inventing the first wearable eye glasses. The earliest pictorial evidence for the use of eyeglasses, however, is Tomaso da Modena's 1352 portrait of the cardinal Hugh de Provence reading in a scriptorium. Another early example would be a depiction of eyeglasses found north of the Alpes in an altarpiece of the church of Bad Wildungen, Germany, in 1403.
FEATURED EYEGLASS ARTICLES:
Eyeglass Lens Prescriptions Explained - Learn what all the information on your eyeglass lens prescription means.
Eyeglass Frame Materials - Eyeglass frames are made of several different types of material. Which is right for you?
Recycling Eyeglasses - Have an old pair of eyeglasses you no longer wear? Don't throw them out...recycle them!
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Sunglasses or sun glasses are a visual aid, variously termed spectacles or glasses, which feature lenses that are coloured, polarized or darkened to prevent strong light from reaching the eyes. In the early 20th century they were also known as sun cheaters (cheaters being an American slang term for glasses).
Sunglasses protect you from harmful UV (ultraviolet rays).Many people find direct sunlight too bright to be comfortable. During outdoor activities, the human eye can receive more light than usual. Healthcare professionals recommend eye protection whenever outside to protect the eyes from ultraviolet radiation, which can lead to the development of a cataract. Sunglasses have long been associated with celebrities and film actors primarily from a desire to hide or mask their identity. Since the 1940s sunglasses have been popular as a fashion accessory, especially on the beach.
FEATURED SUNGLASS ARTICLES:
Sunglasses in the Movies - Sunglasses have always played a major role in Hollywood, and for good reason...they're cool!
History of Sunglasses - Sunglasses have a longer history than you might think.
Discount vs. Designer Sunglasses - Learn why you're always better of in the long run buying authentic designer sunglasses instead of cheap knock-offs.
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A contact lens (also known simply as a contact) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Modern soft contact lenses were invented by the Czech chemists Otto Wichterle and Drahoslav Lím, who also invented the first gel used for their production.
Contact lenses usually serve the same corrective purpose as glasses, but are lightweight and virtually invisible—many commercial lenses are tinted a faint blue to make them more visible when immersed in cleaning and storage solutions. Some cosmetic lenses are deliberately colored to alter the appearance of the eye.
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LASIK or Lasik (laser-assisted in situ keratomileusis) is a type of refractive laser eye surgery performed by ophthalmologists for correcting myopia, hyperopia, and astigmatism. The procedure is generally preferred to photorefractive keratectomy, PRK, (also called ASA, Advanced Surface Ablation) because it requires less time for the patient's recovery, and the patient feels less pain overall. However, there are instances where a PRK/ASA procedure is medically justified as being a better alternative to LASIK.
Many patients choose LASIK as an alternative to wearing corrective eyeglasses or contact lenses.
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Eyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, mollusks, chordates, annelids and arthropods.
The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.
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