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Strength Of Ophthalworld
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| Avg. Hits: 500,000/Month |
USA Database:
17,000 Ophthalmologists,
30,500 Optometrists,
26,000 Opticians and a number of Eye Hospitals , Product manufacturers
and dealers, Eye Institutes, etc. |
Globally:
35,200 Ophthalmologists
30,710 Optometrists
32,403 Opticians
5,970 Hospitals/Laser Clinics
1,422 Manufacturers/Dealers
252 Product Categories |
Newsletters:
Our bi-weekly newsletters are sent to Ophthalmologists and Optometrists
around the globe. |
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Retina
- A delicate, multilayered, light-sensitive membrane lining
the inner eyeball and connected by the optic nerve to the brain.
Cornea - The transparent convex anterior portion of the
outer fibrous coat of the eyeball that covers the iris and the
pupil and is continuous with the sclera(white part of the eye).
Sclera is a tough cover that protects the eyeball.
Iris - The pigmented, round, contractile membrane of
the eye, suspended between the cornea and lens and perforated
by the pupil. It regulates the amount of light entering the
eye.
Macula - The small sensitive area of the retina that
gives central vision; contains the fovea. This foveal area is
covered with a yellow pigment called the macula lutea.
Optic Nerve - The axons of the ganglion cells make up
the optic nerve. The optic nerve connects the retina to the
lateral geniculate nucleus which is in the middle of the brain.
This is the first connection made by the visual system in the
brain.
Vitreous Humor - The clear gel filling the inside of
the eye
The Pupil - The opening at the center of the iris. The
iris adjusts the size of the pupil and controls the amount of
light that can enter the eye
Lens - The lens is the clear part of the eye behind the
iris that helps to focus light on the retina. The lens helps
to focus on both far and near objects so that they are perceived
clearly and sharply.
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How
it works ?
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have an outer transparent cornea, through which light enters
the pupil, the lens, the vitreous and is focused on the retina.
The retina has the receptors called rods, which are sensitive
to dim light and cones, which are sensitive to bright light
and to colours. When the light strikes these receptors, they
get activated. That generates electro-chemical signals .These
are conducted via the optic nerve, to the brain . The brain
has a special area called the visual cortex, which analyses
these signals. It has connections with other areas of the brain,
thus we can interpret what we see! |
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