ABO NOCE Struggle Topics-QUESTIONS WITH
ANSWERS| 2026 | 100% Correct
What is a Spherical lens form?
A lens that has the same curvature in all directions.
(does NOT have to be the same on front and back top be spherical)
What is the main cause of distortion?
Looking in the periphery of a high RX lens
Define Marginal Astigmatism
An undesired power gain when looking away from the optical center
What significant events happened in these years?
1268, 1700, 1900, 1950's:
1268: First pair of glasses ever made by monks
1700: First over-ear glasses and bifocals invented by Ben Franklin
1900: Eyewear becomes more mainstream/accessible
1950's: Begin using material other than glass for lenses
What are the seven steps light takes to form an image in the brain?
1. Light enters thru cornea
2. Enters the chamber behind the cornea
3. Moves thru pupil
4. Crystalline lens focuses thru vitreous gel onto retina
5. Forms an impulse on the retina
, 6. Optic nerve carries thge impulse to the brain
7. Each eye's impulses are fused and form a single image
What are the 3 tunics of the eye?
1. fibrous tunic (outer)
2. vascular tunic (middle)
3. neural/retinal tunic (inner)
What parts make up the Fibrous tunic? (hint: 2)
The Sclera and the Cornea
What parts make up the Vascular tunic? (hint: 5)
Iris, Crystalline Lens, Pupil, Choroid, Aqueous Humor
What parts make up the Neural tunic? (hint: 7)
Retina, Rods, Cones, Macula, Fovea, Vitreous Humor/Gel, Optic Nerve
Name the following refractive indexes:
Air:
Water:
CR-39:
Crown Glass:
Trivex:
Poly:
Hi-Index:
ANSWERS| 2026 | 100% Correct
What is a Spherical lens form?
A lens that has the same curvature in all directions.
(does NOT have to be the same on front and back top be spherical)
What is the main cause of distortion?
Looking in the periphery of a high RX lens
Define Marginal Astigmatism
An undesired power gain when looking away from the optical center
What significant events happened in these years?
1268, 1700, 1900, 1950's:
1268: First pair of glasses ever made by monks
1700: First over-ear glasses and bifocals invented by Ben Franklin
1900: Eyewear becomes more mainstream/accessible
1950's: Begin using material other than glass for lenses
What are the seven steps light takes to form an image in the brain?
1. Light enters thru cornea
2. Enters the chamber behind the cornea
3. Moves thru pupil
4. Crystalline lens focuses thru vitreous gel onto retina
5. Forms an impulse on the retina
, 6. Optic nerve carries thge impulse to the brain
7. Each eye's impulses are fused and form a single image
What are the 3 tunics of the eye?
1. fibrous tunic (outer)
2. vascular tunic (middle)
3. neural/retinal tunic (inner)
What parts make up the Fibrous tunic? (hint: 2)
The Sclera and the Cornea
What parts make up the Vascular tunic? (hint: 5)
Iris, Crystalline Lens, Pupil, Choroid, Aqueous Humor
What parts make up the Neural tunic? (hint: 7)
Retina, Rods, Cones, Macula, Fovea, Vitreous Humor/Gel, Optic Nerve
Name the following refractive indexes:
Air:
Water:
CR-39:
Crown Glass:
Trivex:
Poly:
Hi-Index:
