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Snellen chart. Purpose. Snellen chart is used to estimate visual acuity (last three rows are 20/15, 20/13 and 20/10) 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 ...
Landolt C. Lea test. logMAR chart. 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.
Grill 'Em All – A Los Angeles food truck with a theme inspired by Metallica's album Kill 'Em All.The three heavy metal enthusiasts, Ryan Harkins, Matt Chernus and Joel Brown cook gourmet hamburgers with names like "the hatchet" (with sausage gravy and maple syrup) and "the behemoth" (with cheese sandwiches for buns).
Corneal topography, also known as photokeratoscopy or videokeratography, is a non-invasive medical imaging technique for mapping the anterior curvature of the cornea, the outer structure of the eye. Since the cornea is normally responsible for some 70% of the eye's refractive power, [ 1] its topography is of critical importance in determining ...
The name "West European Isles" is one translation of the islands' name in the Gaelic languages of Irish [201] and Manx, [202] with equivalent terms for "British Isle". [203] [204] In Old Icelandic, the name of the British Isles was Vestrlönd, 'the Western lands'. The name of a person from the British Isles was a Vestmaðr, 'a man from the West ...
The Philippine Area of Responsibility. The Philippine Area of Responsibility ( PAR) is an area in the Northwestern Pacific where PAGASA, the Philippines ' national meteorological agency, monitors weather occurrences. Significant weather disturbances, specifically tropical cyclones that enter or develop in the PAR, are given Philippine-specific ...
Ocular OCT retinal thickness map, right eye Time-domain OCT of the macular area of a retina at 800 nm, axial resolution 3 μm Spectral-domain OCT macula cross-section scan. Optical coherence tomography (OCT) is a technique for obtaining sub-surface images of translucent or opaque materials at a resolution equivalent to a low-power microscope.
Cataract surgery is the most common application of lens removal surgery, and is usually associated with lens replacement. It is used to remove the natural lens of the eye when it has developed a cataract, a cloudy area in the lens that causes visual impairment. [ 4][ 10] Cataracts usually develop slowly and can affect one or both eyes. [ 4]