Question

What are the characteristics of fovea, sclera, choroid ?

Answer 1

Fovea (or Fovea centralis) is the depression in the inner retinal surface, about 1.5mm wide, the photoreceptor layer of which is entirely cones and which is specialized for maximum visual acuity. Within the Fovea is a region of 0.5mm diameter celled the foveal avascular zone (which means without any blood vessels).

The sclera is the part of the eye commonly known as the “white.” It forms the supporting wall of the eyeball, and is continuous with the clear cornea. The sclera is covered by the conjunctiva, a clear mucus membrane that helps lubricate the eye. It is thickest in the area surrounding the optic nerve.

Additional tomographic characteristics of the choroid such as choroidal vascular dilation, convolution, scleral invisibility, and choroidal hyper- or hypo-thickening were identified as well. The distribution of five choroidal tomographic morphology and additional tomographic characteristics in each group were analyzed.