Sentence examples for back of the iris from inspiring English sources

In rare cases, pigment granules break loose from the back of the iris and gradually clog the drainage system.

This unpigmented layer of the ciliary epithelium is continued forward over the back of the iris, where it acquires pigment and is called the posterior iris epithelium.

(2) In persons in whom the angle at the periphery of the anterior chamber is acute i.e., in whom the outer rim of the iris is close to the wall of the eyeball the pressure of aqueous humour upon the back of the iris may force the outer part of the iris against the wall, so as to cover the outlet into the canal of Schlemm.

This could be explained by the posterior vaulting of this lens when implanted in a reverse position on the back of the iris and the adequate space between the lens optic and the back of the iris.

Some of this infra-red light disappears into the pupil (the dark opening in the centre of the iris), and some of it bounces back off the iris (the coloured part of the eye), the cornea (the clear part at the front of the eye), the eyelid or the surrounding skin.

Not to be confused with retinal scanning, which focuses on the pattern of blood vessels in the back of the eye, iris identification works by noting the distribution of distinguishable characteristics-striations, pits, filaments, rings, freckles, and darkened areas-within the eye's colored membrane.

Once you have done this, you go back to the part of the iris underneath the reflection and add a very small bit of the shading in different directions using a darker pencil.

Change back to an ordinary pencil if you used a different one and underneath the shaded part under the reflection, do part of the iris.

The muscles of the iris have been described earlier.

Iris recognition is very effective for person identification due to the iris' unique features and the protection of the iris from the environment and aging.

Shades of raspberry, violet and pepper make up this rare scent, which is distilled from the root of the iris – not the slender 'Siberian' iris typically found in florist shops, but the 'bearded' iris, the type famously painted by Vincent van Gogh.