The Cure of Imperfect Sight by Treatment
Without Glasses - online book

The Original Bates Method, for correcting vision defects

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Emmetropia at the Near-Point
of astigmatism is produced of which hypermetropia forms a part. In the hypermetropic eye the hyperme tropia is increased in one or all meridians. When the myopic eye strains to see a near object the myopia is lessened and emmetropia1 may be produced, the eye being focussed for parallel rays while still trying to see at the near-point. In some cases the emmetropia may even pass over into hypermetropia in one or all merid ians. All these changes are accompanied by evidences of increasing strain, in the form of eccentric fixation
(see Chapter XI) and
lowered vision; but, strange to say, pain and fatigue are usually re lieved to a marked de gree. If, on the contrary, the eye with previously normal vision strains to see at the distance, tem porary myopia is always produced in one or all meridians, and if the eye is already myopic, the myopia is increased. If the hypermetropic eye strains to see a distant object, pain and fatigue may be produced or in creased; but the hyper metropia and the eccen-
The same boy making himself myopic voluntarily by partly closing the eyelids and making a conscious effort to read the test card at ten feet.
1 Emmetropia (from the Greek emmetros, in measure, and ops, the eye) is that condition of the eye in which it is focussed for parallel rays. This con stitutes normal vision at the distance, but is an error of refraction when it occurs at the near-point.