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The largest Alaska moose was shot in western Yukon in September 1897; it weighed 820 kg (1,808 lb), and was 2.33 m (7.6 ft) tall at the shoulder. [7] While the Alaska moose and the Asian Chukotka moose match the extinct Irish elk in size, they are smaller than Cervalces latifrons, the largest deer of all time. [8]
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.
Cervalces scotti size chart. It was as large as the modern moose, with an elk -like head, long legs, and palmate antlers that were more complex and heavily branching than the moose. [ 3 ] Cervalces scotti reached 2.5 m (8.2 ft) in length and a weight of 708.5 kg (1,562 lb).
Some clinics do not have 6-metre eye lanes available, and either a half-size chart subtending the same angles at 3 metres (9.8 ft), or a reversed chart projected and viewed by a mirror is used to achieve the correct sized letters. In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres.
An example of the Landolt C eye chart (also known as the Japanese eye chart). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]
The Western moose [2] (Alces alces andersoni) is a subspecies of moose that inhabits boreal forests and mixed deciduous forests in the Canadian Arctic, western Canadian provinces and a few western sections of the northern United States. It is the second largest North American subspecies of moose, second to the Alaskan moose.
Video of a moose getting a little too close for comfort with a man walking in the woods in Maine recently has gone viral for this exact reason. And the man had every reason to be spooked.
For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. [10] By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.