ABO EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT RATED A+ NEWLY UPDATED
2025
Name the 3 types of tunics of the eye, and what areas of the eye they consist of.
-ANSWER✔✔
1. Fibrous: cornea and sclera (outer protective coating)
2. Vascular: iris, ciliary body, and choroid (uveal tract)
3. Neural: retina
During accommodation, what 3 things do the eyes do?
-ANSWER✔✔
1. Ciliary muscle relaxes, allowing for thickening of the crystalline lens
2. Eyes converge
3. Pupils constrict
What happens with Aniseikonia?
-ANSWER✔✔
The ocular image of an object with one eye differs in size or shape from the other
eye; the brain cannot fuse the images into one.
Difference between Anisometropia and Antimetropia?
-ANSWER✔✔
1. Anisometropia: Refractive errors differ greatly, but are of the same sign
(e.g., both myopic, but different degrees).
2. Antimetropia: Each eye has opposite signs; one is hyperopic (plus), the
other is myopic (minus).
, What is diplopia?
-ANSWER✔✔
Double vision — seeing two images of one object.
What do Iseikonic lenses do?
-ANSWER✔✔
They manipulate image size when dissimilar sizes in the two eyes make it
difficult to fuse images into one.
What is a scotoma? -ANSWER✔✔A blind area of reduced vision in the visual
field
"Fusion" occurs where? -ANSWER✔✔In the brain
The aqueous fluid is continually being manufactured by what? -ANSWER✔✔The
ciliary body
The space between the back of the iris and the front of the lens which is filled with
aqueous is the what? -ANSWER✔✔Posterior chamber
The transparent, colorless mass of soft, gelatinous material which fills the eyeball
behind the lens is the: -ANSWER✔✔Vitreous humor
What is the index of refraction for parts of the eye: cornea, crystalline lens,
aqueous humor, vitreous humor. -ANSWER✔✔Cornea: 1.37
Crystalline lens: 1.42
Aqueous humor: 1.33
Vitreous humor: 1.33
WITH COMPLETE SOLUTIONS 100%
CORRECT RATED A+ NEWLY UPDATED
2025
Name the 3 types of tunics of the eye, and what areas of the eye they consist of.
-ANSWER✔✔
1. Fibrous: cornea and sclera (outer protective coating)
2. Vascular: iris, ciliary body, and choroid (uveal tract)
3. Neural: retina
During accommodation, what 3 things do the eyes do?
-ANSWER✔✔
1. Ciliary muscle relaxes, allowing for thickening of the crystalline lens
2. Eyes converge
3. Pupils constrict
What happens with Aniseikonia?
-ANSWER✔✔
The ocular image of an object with one eye differs in size or shape from the other
eye; the brain cannot fuse the images into one.
Difference between Anisometropia and Antimetropia?
-ANSWER✔✔
1. Anisometropia: Refractive errors differ greatly, but are of the same sign
(e.g., both myopic, but different degrees).
2. Antimetropia: Each eye has opposite signs; one is hyperopic (plus), the
other is myopic (minus).
, What is diplopia?
-ANSWER✔✔
Double vision — seeing two images of one object.
What do Iseikonic lenses do?
-ANSWER✔✔
They manipulate image size when dissimilar sizes in the two eyes make it
difficult to fuse images into one.
What is a scotoma? -ANSWER✔✔A blind area of reduced vision in the visual
field
"Fusion" occurs where? -ANSWER✔✔In the brain
The aqueous fluid is continually being manufactured by what? -ANSWER✔✔The
ciliary body
The space between the back of the iris and the front of the lens which is filled with
aqueous is the what? -ANSWER✔✔Posterior chamber
The transparent, colorless mass of soft, gelatinous material which fills the eyeball
behind the lens is the: -ANSWER✔✔Vitreous humor
What is the index of refraction for parts of the eye: cornea, crystalline lens,
aqueous humor, vitreous humor. -ANSWER✔✔Cornea: 1.37
Crystalline lens: 1.42
Aqueous humor: 1.33
Vitreous humor: 1.33
