Good morning, many days without writing, but let's talk about the vision defects.

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[MYOPIA](https://steemit.com/submit.html)

http://4.bp.blogspot.com/-9BAJTVq1_6I/TaUwRhj2dFI/AAAAAAAAAMk/qhDrvtgN_6U/s1600/miopia.jpg [Image](http://ozesn2.blogspot.com/2011/04/miopia-los-mitos-mas-comunes-sus-tipos.html) *The eye is usually spherical in shape and projects the images with precision in the retina, but there are cases in which the vision becomes blurred, sometimes defects of the eyeball and others by difficulties of the lens to accommodate the distance and the eye does not can make the necessary adjustments so that the image is projected in the retina the most common defects are:*

MYOPIA SYMPTOMS

[Blurred vision of distant objects](https://steemit.com/submit.html)

[Squint](https://steemit.com/submit.html)

[Tired view](https://steemit.com/submit.html)

[Headaches](https://steemit.com/submit.html)

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[HYPEROPIA](https://steemit.com/submit.html)

http://www.desimd.com/sites/default/files/Hyperopia.jpg [image](http://www.desimd.com/health-education/eye-disorders/hypermetropia-symptoms-causes-and-treatment) *It is characterized by a blurred distant vision, and is caused by an elongation of the eyeball; so that the image is formed in front of the retina, is corrected with the use of Biconcave lenses, laser surgery is also used to correct it when it comes to advanced cases.*

HYPEROPIA SYMPTOMS

Blurred vision of close objects

Ocular fatigue

Eye pain

Headache

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[ASTIGMATISM](https://steemit.com/submit.html)

http://www.dralexandra.com/wp-content/uploads/2016/02/astigmatism.jpg [image](http://www.dralexandra.com/Lasik-surgery-astigmatism) *It is characterized by blurred near vision, caused by the shortening of the diameter of the eyeball, so that the image is formed behind the retina, is corrected with the use of biconvex lenses or laser surgery.*

ASTIGMATISM SYMPTOMS

Blurred visions

Double vision

Observe a series of lines or points whose color differs from their background

Headaches

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[PRESBICIA](https://steemit.com/submit.html)

*Sometimes the cornea is not completely smooth, but has dents, which deflect the direction of the beam of light, so that the visual field is not completely clear, has out of focus areas, is corrected using polished lenses in such a way that they compensate These inequalities in the curvature of the natural lens or by laser surgery.*

PRESBICIA SYMPTOMS

Eye strain

Tired eyes

Headache

*It is the process of hardening of the crystalline lens and the muscles that sustain it, by aging so that it does not adapt well neither to near nor far vision, requirement lenses that contain both corrections can be bifocal or multifocal.*

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[BYE EVERYONE!](https://steemit.com/submit.html)