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A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders .
Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.
Double lens anti-fog ski goggles were invented and patented by Robert Earl "Bob" Smith. [3] [4] [5] Visible Light Transmission (VLT) or S value describes the percentage of light allowed through the lens. [6] Astronomy and meteorology: dark adaptor goggles are used before going outside at night, in order to help the eyes adapt to the dark.
Safilo Group S.p.A. (acronym of Società Azionaria Fabbrica Italiana Lavorazione Occhiali) is an Italian company that designs, produces, and distributes prescription frames, sunglasses, sports eyewear, ski goggles and helmets, and cycling helmets under its own five house brands and 32 licensed brands, including Smith Optics since 1996.
An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [ 1 ] Eye charts are often used by health care professionals, such as optometrists , physicians and nurses , to screen persons for vision impairment .
Warren J. Smith (1922-2008) was president of the Optical Society of America in 1980. [1] Warren Smith is world-renowned in the optics community as author of two editions of Modern Optical Engineering - The Design of Optical Systems, Modern Lens Design - A Resource Manual and Practical Optical Systems Layout. He was a Founder and President of ...
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