Q. Fovea in the eye is a central pit in the yellowish pigmented spot called
Solution:
The innermost layer of the eye is called Retina (Neurosensory Tunic).
Internally, retina is made up of three layers
1. ganglion cells (towards choroid)
2. bipolar cells and
3.photo-receptor cells (towards lens)
These cells contain light sensitive proteins termed as photo-pigments. The photo-receptor cells are of two types, called rods and cones.
The part of retina present on the visual axis is very thin and contains only cone cells filled with a yellow pigment. Hence, this part is called yellow spot or macula lutea. It is the thinnest part of the retina and has no blood supply. In man and other mammals this area has a small shallow depression called fovea centralis. It is the most sensitive part of an eye, i.e. the area having the greatest visual acuity (resolution). It is also claimed that the cone cells in fovea centralis are placed somewhat obliquely to form magnified images of object.
Internally, retina is made up of three layers
1. ganglion cells (towards choroid)
2. bipolar cells and
3.photo-receptor cells (towards lens)
These cells contain light sensitive proteins termed as photo-pigments. The photo-receptor cells are of two types, called rods and cones.