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  2. Presbyopia - Wikipedia

    en.wikipedia.org/wiki/Presbyopia

    Presbyopia, like other focal imperfections, becomes less noticeable in bright sunlight when the pupil becomes smaller. [8] As with any lens, increasing the focal ratio of the lens increases depth of field by reducing the level of blur of out-of-focus objects (compare the effect of aperture on depth of field in photography ).

  3. Hand signaling (open outcry) - Wikipedia

    en.wikipedia.org/wiki/Hand_signaling_(open_outcry)

    Hand signalling on the floor of the Chinese Gold and Silver Exchange Society Hand signaling , also known as arb [ 1 ] or arbing (short for arbitrage ), is a system of hand signals used on financial trading floors to communicate buy and sell information in an open outcry trading environment.

  4. Refractive error - Wikipedia

    en.wikipedia.org/wiki/Refractive_error

    When refractive errors in children are not treated, the child may be at risk of developing ambylopia, where vision may remain permanently blurry. [33] Because young children typically do not complain of blurry vision, the American Academy of Pediatrics recommends that children have yearly vision screening starting at three years old so that unknown refractive errors or other ophthalmic ...

  5. Laser blended vision - Wikipedia

    en.wikipedia.org/wiki/Laser_blended_vision

    Presbyopia is not reversed by Laser Blended Vision, which is a highly effective treatment but not a cure and as presbyopia is a progressive condition, a boost may be required some years after treatment. Typically the effects of Laser Blended Vision surgery last between 5 and 10 years and most patients are able to have an enhancement procedure ...

  6. Hand geometry - Wikipedia

    en.wikipedia.org/wiki/Hand_geometry

    A hand geometry reading device with pegs to control the placement of the hand. Angled mirror on the left reflects the side view image of the hand to the camera. A CCD camera is beneath the keypad to take the top view image of the hand and the mirror image. [2] Hand geometry is a biometric that identifies users from the shape of their hands ...

  7. Farsightedness - Wikipedia

    en.wikipedia.org/wiki/Farsightedness

    It then becomes more common again after the age of 40, known as presbyopia, affecting about half of people. [4] The best treatment option to correct hypermetropia due to aphakia is IOL implantation. [2] Other common types of refractive errors are near-sightedness, astigmatism, and presbyopia. [10]

  8. Myopia - Wikipedia

    en.wikipedia.org/wiki/Myopia

    Twin studies indicate that at least some genetic factors are involved. [27] [36] [37] Myopia has been increasing rapidly throughout the developed world, suggesting environmental factors are involved. [38] A single-author literature review in 2021 proposed that myopia is the result of corrective lenses interfering with emmetropization. [39]

  9. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    36 represented in chisanbop, where four fingers and a thumb are touching the table and the rest of the digits are raised. The three fingers on the left hand represent 10+10+10 = 30; the thumb and one finger on the right hand represent 5+1=6. Counting from 1 to 20 in Chisanbop. Each finger has a value of one, while the thumb has a value of five.