Myopia, commonly known as nearsightedness, is a condition where light entering the eye focuses in front of the retina rather than directly on it. This causes distant objects to appear blurry while close objects are in focus. It occurs when the eyeball grows too long or the cornea has too much curvature. Myopia can be classified by degree of severity from low to high based on the strength of corrective lens needed. Common symptoms include blurred distance vision and eye strain. It is easily corrected using eyeglasses, contact lenses, refractive surgery, or vision shaping treatment.

2. Myopia "eye", commonly known as
being nearsighted and shortsighted. A
condition of the eye where the light that
comes in does not directly focus on the retina
but in front of it. This causes the image that
one sees when looking at a distant object to
be out of focus but in focus when looking at a
close object.

3. Image showing the effect of myopia
A condition of the eye where the light that comes in does not directly focus on
the retina but in front of it. This causes the image that one sees when looking at
a distant object to be out of focus but in focus when looking at a close object.

4. By Cause
 Axial myopia is attributed to an increase in the eye's axial
length.
 Refractive myopia is attributed to the condition of the
refractive elements of the eye. Borish further subclassified
refractive myopia:
 Curvature myopia is attributed to excessive, or increased,
curvature of one or more of the refractive surfaces of the
eye, especially the cornea. In those with Cohen syndrome,
myopia appears to result from high corneal and lenticular
power.
 Index myopia is attributed to variation in the index of
refraction of one or more of the ocular media.

5. BY Degree
Myopia, which is measured in diopters by the strength
or optical power of a corrective lens that focuses distant
images on the retina, has also been classified by degree
or severity:
• Low myopia usually describes myopia of −3.00
diopters or less (i.e. closer to 0.00).
• Medium myopia usually describes myopia between
−3.00 and −6.00 diopters.Those with moderate
amounts of myopia are more likely to have pigment
dispersion syndrome or pigmentary glaucoma.
•High myopia usually describes myopia of −6.00 or
more.People with high myopia are more likely to
have retinal detachments and primary open angle
glaucoma.Roughly 30% of myopes have high myopia.

6. Signs and symptoms
An eye care professional can diagnose
nearsightedness with a simple eye
exam. The most common symptoms of
nearsightedness include:
•Blurred distance vision
•Frequent squinting of eyes
•Eye strain or headaches from trying to
focus

8. Treatments for Nearsightedness
Nearsightedness is easily corrected by refocusing the light
rays onto the retina of the eye. This is commonly done
through:
•Eyeglasses and contact lenses: The simplest treatment
option chosen by most patients with
nearsightedness. PureVision2 contact lenses deliver the
clear, crisp vision that you should demand – designed to
reduce halos and glare – especially in low light.
•Bausch + Lomb Vision Shaping Treatment (VST) - an
innovative process that uses customized shaping lenses to
gently correct your vision while you sleep so you can enjoy
clear vision while you’re awake
•Surgery: Surgical options are available, but can be
expensive, and may involve more risk than contact lens
options available. These procedures use laser technology
or manual incisions to remove small amounts of tissue
from the cornea.

9.  Cured eye with concave lens