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Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia ) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both.
In glasses with powers beyond ±4.00D, the vertex distance can affect the effective power of the glasses. [4] A shorter vertex distance can expand the field of view, but if the vertex distance is too small, the eyelashes will come into contact with the back of the lens, smudging the lens and causing annoyance for the wearer.
Central visual acuity of 20/200 or less in the better eye with corrective glasses or central visual acuity of more than 20/200 if there is a visual field defect in which the peripheral field is contracted to such an extent that the widest diameter of the visual field subtends an angular distance no greater than 20 degrees in the better eye. [22]
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The chain offers optometry and optician services for eyesight testing and sells glasses, sunglasses, and contact lenses. It also sells hearing aids . In the United Kingdom in 2012, it had the largest single market share of the four major opticians , with 42% of the market.
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]
On July 12, 2023, Subaru's Philippine distributor Motor Image Pilipinas officially launched the third generation Crosstrek with two trims: 2.0i-L and 2.0i-S, equipped with Subaru's EyeSight 4.0. [63] The third generation Crosstrek debuted in Vietnam at the Vietnam Motor Show on October 23, 2024, with two variants.
EyeSight has been very popular, equipped on approximately 90% of all Legacy and Outbacks sold in Japan at the beginning of 2012, [48] and the engineers responsible for its development won a prize from the Japanese government that year. [50] As of 2021, EyeSight is standard on the Ascent, Forester, Legacy, and Outback. It is also standard on all ...