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Hays Travel was founded in 1980 by John Hays in Seaham, Durham. Hays initially opened a small retail store behind his mother's clothing store. [3] Since May 2018, Hays Travel reached sales of over £1 billion. [4] The company's turnover increased by £42 million over 2017, when pre-tax profit was up slightly to £10.1 million.
When the pupil is small (1–2 mm), image sharpness may be limited by diffraction of light by the pupil (see diffraction limit). Between these extremes is the pupil diameter that is generally best for visual acuity in normal, healthy eyes; this tends to be around 3 or 4 mm.
The Worth Four Light Test, also known as the Worth's four dot test or W4LT, is a clinical test mainly used for assessing a patient's degree of binocular vision and binocular single vision. Binocular vision involves an image being projected by each eye simultaneously into an area in space and being fused into a single image.
Stereoacuity [1] is most simply explained by considering one of its earliest test, a two-peg device, named Howard-Dolman test after its inventors: [2] The observer is shown a black peg at a distance of 6m (=20 feet). A second peg, below it, can be moved back and forth until it is just detectably nearer than the fixed one.
Hay's test, also known as Hay's sulphur powder test, is a chemical test used for detecting the presence of bile salts in urine. [1] Procedure.
Hays Travel, a travel agency chain based in Sunderland, England; See also ... This page was last edited on 12 January 2023, at 16:14 (UTC).
Positive relative accommodation (PRA) in biology, is a measure of the maximum ability to stimulate eye accommodation while maintaining clear, single binocular vision. [1] This measurement is typically obtained by an orthoptist , ophthalmologist or optometrist during an eye examination using a phoropter .
Hays earned a degree in mathematics from the University of Oxford. [3] He later earned an MBA from Manchester Business School. [4] In 1980, Hays founded Hays Travel in the back of his mother's children's wear store in Seaham, Durham. [5] Hays owned 56.42% and his wife Irene owned 43.58%. [6]