American Board of Opticianry (ABO) Practice Test

Which part of the eye consists of the sclera and the cornea?

1. Choroid

2. Retina

3. Iris

4. Fibrous Tunic

The correct answer is: Fibrous Tunic

The fibrous tunic is the outer layer of the eye that is made up of the sclera and the cornea. The sclera is the white outer layer of the eye that provides structure and protection, while the cornea is the clear covering over the front of the eye that helps to focus light into the eye. The choroid, retina, and iris are all part of the middle layer of the eye called the vascular tunic. The choroid helps to provide oxygen and nutrients to the retina, the retina is responsible for converting light into neural signals, and the iris controls the amount of light that enters the eye. Therefore, these options are incorrect as they do not specifically refer to the sclera and cornea, which are the main components of the fibrous tunic.