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Range of vision correction and vision

Is For example, a correction of myopia before the far point s: 0.20m, near point,[link widoczny dla zalogowanych],: 0.1om, visual areas only 0.1Om asked to 0.20m. For myopia correction, by (2) know. = Ke = a luminosity of a 5.0 second 500 degrees, from (4) shows corrected near point into 24 * Luoyang University 1998-0l20m, vision into a 0.20m interval to. . . Far point and near points have been improved. 4 hyperopia corrected visual acuity after correction of hyperopia before the interval set the far point of s. , Near point is s:, corrected into a near point, far point discussed below s and corrected, and in the relationship. To u = s1. Port = a s1 generation (1). A + = 7 'from the far point of hyperopia corrected as = s, (5) of the convergent lens has> O,[link widoczny dla zalogowanych], f> 0, so s 0.25m), G to both the need for correction of myopia and hyperopia needs to be corrected. We call this situation as complex vision correction, referred to as composite correction. Composite correction of myopia in the elderly patients in the part of the very important practical significance. We were so in and in the correction of myopia and hyperopia correction for the eyes of the focal power, the front (2), (3), respectively, to 1 in the I = a, (6)】 1 = 4 A ÷,[link widoczny dla zalogowanych], (7) 2 obviously. Not less than the near point far point, and therefore, 2 Li Zhimin: vision correction and vision range】> 52, ( Cool

simultaneous (6), (7), ( Cool

may (4 +】, (9) (9) is a complex relationship must be observed correct. of moderate myopia (nearsightedness 200 degrees) or more myopic patients, because of its far point 5 (0.50m,[link widoczny dla zalogowanych], the near point 5 can not be greater than the far point, it is generally not for hyperopia correction. only then for hyperopia correction, by (9) shows that the hyperopic lens wear also 2OO degrees below, is not particularly meaningful. hyperopic correction is usually required for those with mild myopia (nearsightedness 2OO degrees or less) of the elderly. because 5> 0.5m, it is possible to:> 0.5m. For example,[link widoczny dla zalogowanych], a person wearing: a 1OO degree of myopia, by (6), knowing far point = 10m, as they near point 5: = 067m, from (7) to know the focus of hyperopic lens is 12 = 4 I: 2.5 diopter: +250 degrees - from (9) to know that the person wearing the maximum hyperopic lens 2max = 4 + ( A 1.0) = 3.0 diopters = +300 degrees, this time, corresponding to 5: lm, near points and far points coincide.