VS.

Presbyopia vs. Emmetropia

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Presbyopianoun

Inability of the eye, due to ageing, to focus on nearby objects; farsightedness

Emmetropianoun

The condition of perfect vision, where images are correctly brought to a focus on the retina.

Presbyopia

A defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which produces difficulty of accommodation and recession of the near point of vision, so that objects very near the eyes can not be seen distinctly without the use of convex glasses. Called also presbytia.

Emmetropianoun

That refractive condition of the eye in which the rays of light are all brought accurately and without undue effort to a focus upon the retina; - opposed to hypermetropia, myopia, and astigmatism.

Presbyopianoun

farsightedness resulting from a reduced ability to focus caused by loss of elasticity of the crystalline lens with age

Emmetropianoun

(ophthalmology) the normal refractive condition of the eye in which there is clear focus of light on the retina

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Presbyopia

Presbyopia is physiological insufficiency of accommodation associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects. Symptoms include difficulty reading small print, having to hold reading material farther away, headaches, and eyestrain.

Emmetropia

Emmetropia is the state of vision in which a faraway object at infinity is in sharp focus with the eye lens in a neutral or relaxed state. That condition of the normal eye is achieved when the refractive power of the cornea and the axial length of the eye balance out, which focuses rays exactly on the retina, resulting in perfect vision.

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