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Differentiate between choroid and retina

Dear student,

The organs of sight are a pair of eyes which are situated in deep protective bony cavities, called the orbits or eye sockets of the skull. Eyes consist of tissues present in three layers.
   CHOROID:
  • Middle vascular layer consists of choroid.
  • Choroid is present beneath the sclera and contains numerous blood vessels and nourishes the retina.
  • It becomes thick in the anterior part to form the cilliary body which holds the lens in position.
  • Iris forms a pigmented circle attached to the cilliary body to the lens. The movement of iris controls the size of the pupil.
RETINA:
  • The retina is an inner sensitive layer.
  • The inner layer is the retina and it contains different layers of cells, from inside to outside such as layers of ganglion cells, bipolar cells, photoreceptor cells and pigment cells. The photoreceptors or visual cells are of two types- rods and cone cells. Rods contain a photosensitive pigment called rhodopsin.
  • In retina of human eyes, cones are of three types which possess characteristic photopigments that respond to red, green and blue lights. The daylight vision and colour vision are functions of cones and the twilight vision is the function of the rods.

Regards         

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The difference between retina and choroid is that retina is composed of thin layer of cells at the back of eye ball .it is circular disc. Choroid is composed of vascular layer of cells .it lies between sclera and retina .
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Retina
1. It is the thin layer of cells at the back of the eyeball.
2. In retina, light is converted into neural signals and is sent to the brain. 
3. It is a circular disc.
4. It is the third and inner coat of the eye.

Choroid
1.Choroid is know as choroidea or choroid coat.
2. Choroid is the vascular layer of the eye.
3. It is lying between the retina and sclera.
4. It provides oxygen and nourishment to the outer layers of retina.


 
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