Question

which of the following parts of the eye is continuous with the cornea and forms the outer surface of the back of the eye?
o retina
o choroid
o oval window
o iris
o sclera
skill: understanding
question 7
1 pts
color blindness usually results from a decrease in the number of
o rods.
o optic discs.
o foveas.
o cones.
o ciliary muscles.

Explanation:

• For the first question: The sclera is the tough, white outer layer of the eye. It is continuous with the cornea (the clear front part of the eye) and forms the outer surface of the back of the eye. The retina is the light - sensitive layer at the back of the eye that contains photoreceptors. The choroid is a vascular layer between the retina and the sclera. The oval window is part of the ear (not the eye). The iris is the colored part of the eye that controls the size of the pupil.
• For the second question: Cones are photoreceptor cells in the retina that are responsible for color vision. A decrease in the number of cones can lead to color blindness. Rods are mainly responsible for vision in low light. The optic disc is the area where the optic nerve leaves the eye (blind spot). The fovea is a small, central pit in the retina with a high concentration of cones (for sharp central vision). Ciliary muscles are involved in changing the shape of the lens for accommodation.

Answer:

• First question: sclera
• Second question: cones