Good morning, many days without writing, but let's talk about the vision defects.
MYOPIA
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
Squint
Tired view
Headaches
HYPEROPIA
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
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
PRESBICIA
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.