Posted on 11th Aug 2014
Many people who have been able to see their whole life wonder why they start having difficulty seeing near, and feel the need for reading glasses. By the age of 20, slow physiological changes start to happen and the lens, which helps to clearly see objects at different distances, starts to lose elasticity. The lens is inside the eye and changes shape using small muscles, changes the refraction of light at the bottom of the eye, from which it enters the brain as a sharp image. Initially, the effect of the process is invisible, but by the time most people turn 40, they realize their hands are getting "too short".
Presbyopia, or vision changes due to age, is
manifested in the weakening of near vision after 40 years of life. At first, it
may manifest as eye fatigue at night, at dusk or slow visual acuity at different
distances (eg looking into the distance, and then at near). This can also can be
a symptom resulting from eyestrain.
Changes always occur, regardless of
whether glasses are worn before or not. It is also impossible to slow down
age-related weakening of the eye with exercises for the eyes, or in any other
way. More noticeable changes of the eye lens come for people around 50 years
old, when the prescription for glasses changes faster. Typically, the process
slows down around 60 year olds. What to do? It is advisable to check your eyes
every year. Presbyopia is corrected with glasses and contact lenses. There are
many different types of glasses such as reading glasses, bifocal glasses, office
glasses, and progressives. Also, there are different solutions for contact
lenses: progressive lenses or conventional contact lenses (one eye is corrected
for distance viewing, and the other eye on looking at near). To find the right
solution, consult with an optometrist.
For people who have not come into
contact with glasses, wearing glasses at first may seem awkward and unfamiliar.
But clear vision of life will substantially improve the quality of life, and
soon you'll notice that the glasses are not only important to use, and more of
an indispensable accessory. For the best choice for eyeglass frames, you will be
given advice from optometrists and staff.
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Let us remember the Helmholtz mechanism of accommodation. In response to defocusing the image on the retina nerve impulses run through the reduction of parasympathetic part of the oculomotor nerve to the ciliary muscle; muscle contracts; ciliary ligament relax; tension of the lens capsule is reduced; lens due to its elasticity becomes more convex and [...]