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Food stuff ration coupons types I–V for direct laborers and workers in Vietnam, 1976–1986. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product.
Myopia can be corrected with eyeglasses, contact lenses, or by refractive surgery. [1] [16] Eyeglasses are the simplest and safest method of correction. [1] Contact lenses can provide a relatively wider corrected field of vision, but are associated with an increased risk of infection.
With respect to FWER control, the Bonferroni correction can be conservative if there are a large number of tests and/or the test statistics are positively correlated. [ 9 ] Multiple-testing corrections, including the Bonferroni procedure, increase the probability of Type II errors when null hypotheses are false, i.e., they reduce statistical ...
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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. [21]
The total aberration of two or more very thin lenses in contact, being the sum of the individual aberrations, can be zero. This is also possible if the lenses have the same algebraic sign. Of thin positive lenses with n=1.5, four are necessary to correct spherical aberration of the third order.
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