The lens of the eye have no blood vessel. Why?
Answers:
It would lessen the amount of light that enter the eye. The lens must be completely clear, and blood vessels are dark.
Do you know for a fact that the lens of the eye have no blood vessels. I don't know anything roughly the anatomy of the human eye lens, but common sense tell me that everything in your body is nourish by the life giving blood, which also provide oxygen needed to body parts, or they will die.To assume that the lens does NOT entail blood to nourish it, imply that it is a non-living part of our body. How can this be?
Because its the lens. The situation of the lens is to refract light so that wispy rays all converge on a trustworthy point on the retina, thereby forming a clear images. Blood vessel, would I suppose, inhibit the proper passage of table lamp and would alter the focal lenght of the lens, thus, preventing its efficeny. The lens takes up oxygen directly form its surroundings.
If it have then the lens wouldn't be transparent and you wouldn't know how to see through it.
The lens is a biconvex transparent body. It is made up of a fibrous, jelly-like material. It have to remain transparent so that the light endorsement through the pupil will pass through the lens and trickle on the retina. As an embryo, there is a hyaloid artery which profuses the developing lens but around 29-32 weeks, it regresses. Because lens have no blood supply, the aqueous humor performs the blood’s commission of carrying nutrients to those structures.
Because it's an epithelium (ectodermic embrionary origin), as dermis, and epitheliums have no blood vessel.
like everyone else said the lens desires to be transparent and so does not have blood supply.
during develoment contained by the embryo the lens is supplied by the hyaloid artey which atrophies later during dev. so during and after birth the lens have no blood supply. it recieves nutrition from the aqueous and vitreous humor(which are two types of fluids in the eye ball) inspite of not have a blood supply the lens keeps on growing for time and also retains old cell and in this respect it is new from other organs. at birth its weight is give or take a few 65mg and by 80yrs of age it is found to be about 258 mg.
in that are other tissues in the body which are avascular(not supplied by blood): they are:
1. menisci within the knee
2. cornea
Actually the lens is not completely clear. The lens is biconvex within shape, like () and going right down the middle, vertically, is a highly dense area. As to why it contains no blood vessel, I'm not sure. I know the Choroid layer is the solely layer to contain blood vessel.
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