Eagle eye lens

The large lens of a wedge-tailed eagle is quite complicated. It can easily move front and back to be able to change the size of the image on the retina. Both cornea and lens are angled towards the beak which increase overlap even more. The human and eagle eye lenses work differently. Pecten, a part of the eagle lens proves that. Its function is to nourish the retina without blood vessels. The pecten also 

- keep the fluids in the vitreous body at the right pressure 

- Absorb light to reduce the chance of reflections inside the eye, which can distort vision

- Helps birds perceive motion

- Provides shade from the sun

 - Senses magnetic objects 

The wedge-tailed eagle has good accomodation, and unlike human lenses, the wedge-tailed's lens very rarely has disabilities. However, they are prone to diseases, such as Conjunctiva, which is caused by ammonia. Conjunctiva causes the eye to swell and become sensitive to light.