ABO EXAM PRE-TEST CERTIFICATION REVIEW
2026 FULL SOLUTION SET
◉ Fibrous Tunic. Answer: Consists of the sclera and the cornea.
◉ Vascular Tunic. Answer: Consists of the iris, the choroid, and the
ciliary body and is responsible for nourishment
◉ Nervous Tunic. Answer: The inner layer of photoreceptors and
neurons which consists of the retina;
Contains rods and cones
◉ Rods. Answer: Lets us see at twilight and in dimly lit rooms; does
not discriminate between different colors of light.
About 120 million rods
◉ Cones. Answer: Cones require brighter light to function than rods
do;
Discriminate colors.
About 6 million in Fovea
◉ Macula. Answer: Where light will focus in a
, healthy eye
◉ Fovea. Answer: The highest concentration of cones is found at the
fovea which is the center of the macula
◉ Optic Disc (Blind Spot). Answer: The point where the optic nerve
enters the eye;
Does not contain receptor cells so it is sometimes called the "blind
spot"
◉ What are the three fluid-filled chambers in the eye?. Answer:
Anterior Chamber
Posterior Chamber
Vitreous Chamber
◉ Anterior Chamber. Answer: Located between the cornea and the
iris
◉ Posterior Chamber. Answer: Located between the iris and the lens
◉ Vitreous Chamber. Answer: Located between the retina and the
lens;
Is filled with a thicker gel-like substance called Vitreous humor
which maintains the shape of the eye
2026 FULL SOLUTION SET
◉ Fibrous Tunic. Answer: Consists of the sclera and the cornea.
◉ Vascular Tunic. Answer: Consists of the iris, the choroid, and the
ciliary body and is responsible for nourishment
◉ Nervous Tunic. Answer: The inner layer of photoreceptors and
neurons which consists of the retina;
Contains rods and cones
◉ Rods. Answer: Lets us see at twilight and in dimly lit rooms; does
not discriminate between different colors of light.
About 120 million rods
◉ Cones. Answer: Cones require brighter light to function than rods
do;
Discriminate colors.
About 6 million in Fovea
◉ Macula. Answer: Where light will focus in a
, healthy eye
◉ Fovea. Answer: The highest concentration of cones is found at the
fovea which is the center of the macula
◉ Optic Disc (Blind Spot). Answer: The point where the optic nerve
enters the eye;
Does not contain receptor cells so it is sometimes called the "blind
spot"
◉ What are the three fluid-filled chambers in the eye?. Answer:
Anterior Chamber
Posterior Chamber
Vitreous Chamber
◉ Anterior Chamber. Answer: Located between the cornea and the
iris
◉ Posterior Chamber. Answer: Located between the iris and the lens
◉ Vitreous Chamber. Answer: Located between the retina and the
lens;
Is filled with a thicker gel-like substance called Vitreous humor
which maintains the shape of the eye
