The central portion of the front of the eyeball is termed as iris. Iris is a pigmented structure. Eye color (black, brown, blue etc.) is defined by the pigmentation of iris. The central aperture ...

Each chapter is a skilful blend of anatomy and up-to-date physiology ... Chapter 1, "The formation of the human eye," focuses on overall eye embryology, whereas most of the other chapters have ...

The human eye belongs to a general group of eyes found in nature called "camera-type eyes." Just as a camera lens focuses light onto film, a structure in the eye called the cornea focuses light ...

A close-up photograph of what appears to be a light-brown human eyeball shows the organ's expansive, cavernous depths surrounding a seemingly bottomless, black pit that, together, mimics the ...

Scientists have come up with scenarios through which the first eye-like structure, a light-sensitive pigmented spot on the skin, could have gone through changes and complexities to form the human ...

A team of scientists has now uncovered the precise structure of the alpha-A-crystallin protein and, in the process, discovered an important additional function. The lens of the human eye comprises ...

So, at the outset, nocturnal eyes gather more light than human eyes do ... The retina is an extremely complex structure. It's made up of at least 10 distinguishable layers, and is packed with ...

There are three broad areas: human anatomy animal anatomy — zootomy plant ... to the study of the biological structures that the eye can see. In other words, a person does not need a microscope ...