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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.
The Whippet is a medium-sized dog: the ideal height for bitches is 44 to 47 cm (17.5 to 18.5 in), and for dogs 47 to 51 cm (18.5 to 20 in). [ 26 ] [ 27 ] The standards of the American Kennel Club and Canadian Kennel Club allow for larger animals, with an upper limit of 55 cm (21.5 in) for bitches and 57 cm (22.5 in) for dogs.
The Yorkshire Terrier, also known as a Yorkie, is a British breed of toy dog of terrier type. It is among the smallest of the terriers and indeed of all dog breeds, with a weight of no more than 3.2 kg (7 lb). [ 1] It originated in the nineteenth century in the English county of Yorkshire, after which it is named. [ 2]
standard. Dog ( domestic dog) The Cavalier King Charles Spaniel ( CKCS) is a British breed of toy dog of spaniel type. Four colours are recognised: Blenheim (chestnut and white), tricolour (black/white/tan), black and tan, and ruby; the coat is smooth and silky. [ 1] The lifespan is usually between eight and twelve years.
The Jack Russell Terrier is a British breed of small terrier.It is principally white-bodied and smooth-, rough- or broken-coated, and can be any colour. It derives from dogs bred and used for fox-hunting in North Devon in the early nineteenth century by a country parson, Jack Russell – for whom the breed is named – and has similar origins to the modern Fox Terrier.
standard. Dog ( domestic dog) The Labrador Retriever or simply Labrador is a British breed of retriever gun dog. It was developed in the United Kingdom from St. John's water dogs imported from the colony of Newfoundland (now a province of Canada ), and was named after the Labrador region of that colony. It is among the most commonly kept dogs ...
The Border Collie is a British breed of herding dog of the collie type of medium size. It originates in the region of the Anglo-Scottish border, and descends from the traditional sheepdogs once found all over the British Isles. It is kept mostly as a working sheep-herding dog or as a companion animal. [ 1] It competes with success in sheepdog ...