In emmetropia, or normal vision, the center of the visual
field is in sharp focus, and the periphery is blurred. The retina on the nasal side of each eye is
responsible for the peripheral vision on that side. The retina on the temporal side is
responsible for the overlapping field on the opposing side of the body. Light hitting the fovea gives the sharpest
image right in the center of the field of view.
Once light strikes the retina, photoreceptors generate graded potentials
and pass them to the optic nerve. Peripheral
vision has to cross the body in the optic chiasm because of the brain’s
contralateral processing. The
information is carried to the thalamus, which routes the information to the
optic radiations. From there, it travels
to the occipital lobe for processing.
Light that fell on the optic disc generates no image.
Thursday, November 3, 2016
Emmetropia: Normal Vision
In emmetropia, or normal vision, the center of the visual
field is in sharp focus, and the periphery is blurred. The retina on the nasal side of each eye is
responsible for the peripheral vision on that side. The retina on the temporal side is
responsible for the overlapping field on the opposing side of the body. Light hitting the fovea gives the sharpest
image right in the center of the field of view.
Once light strikes the retina, photoreceptors generate graded potentials
and pass them to the optic nerve. Peripheral
vision has to cross the body in the optic chiasm because of the brain’s
contralateral processing. The
information is carried to the thalamus, which routes the information to the
optic radiations. From there, it travels
to the occipital lobe for processing.
Light that fell on the optic disc generates no image.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment