ABO FINAL PAPER Questions with Correct Answers (Grade A+)
Question 1: Endothelium.
Answer: Cornea
Question 2: What are the layers of the cornea?
Answer: • Epithelium
Question 3: Total thickness of the cornea.
Answer: 0.50mm
Question 4: Thickest part of cornea (makes up 90%).
Answer: Stroma
Question 5: When a high powered minus lens is moved closer to the eye, the compensated power must:.
Answer: Be decreased.
Question 6: When a plus lens is moved closer to the eye, it's effective power:.
Answer: Decreases
Question 7: It is important to consider vertex distance in spectacle lenses when the power exceeds:.
Answer: ± 7.00 D
Question 8: Fused bifocals are available in:.
Answer: Flat top and Round
Question 9: In a round bifocal segment you find the optical center located:.
Answer: In the geometric center.
Question 10: The intermediate power most common in tri-focal lenses is:.
Answer: 50% of the add power
Question 11: Which bifocal segment contains the least amount of image jump?
Answer: Flat top
Page 1
,Question 12: What is the Index of refraction for Polycarbonate?
Answer: 1.586
Question 13: What is the index of refraction for Air:.
Answer: 1.0
Question 14: What is the index of refraction for Crown Glass?
Answer: 1.523
Question 15: What is the index of refraction for CR-39?
Answer: 1.490
Question 16: What is the index of refraction for Hi-index?
Answer: 1.60
Question 17: What is the index of refraction for Flint Glass?
Answer: 1.805
Question 18: What is the index of refraction for Titanium Glass?
Answer: 1.701
Question 19: How can cataract spectacle lenses be made?
Answer:
1. With
2. aspheric front surfaces
3. As lenticular designs
4. As full field lenses
Question 20: When compared to conventional spherical lenses, aspheric lenses are:.
Answer: Thinner and flatter with improved optics.
Question 21: The usefulness of cataract spectacle lenses can be improved by using:.
Answer: Aspheric front curves.
Question 22: How can aspheric lenses can by identified by manufacturers?
Answer: By referring to engraved ID markings.
Page 2
,Question 23: The minimum fitting height for most progressive addition lenses is:.
Answer: 22-25 mm, depending on the brand.
Question 24: The best candidates for progressive powered lenses are:.
Answer: Early presbyopes.
Question 25: Chromatic aberration is virtually nonexistent at the:.
Answer: Optical center
Question 26: A lens defect that bends light rays of different colors at different angles and focuses them
on different planes.
Answer: Chromatic Abberation
Question 27: "Conventional" slab-off is ground with base up prism in the reading portion only on the
lens with the ____________ in the vertical meridian.
Answer: Most minus / Least plus
Question 28: Bicentric grinding (slab-off) is generally prescribed for the correction of:.
Answer: Excessive prismatic imbalance at the reading level (vertical imbalance).
Question 29: When calculating vertical prismatic imbalance, all of the following need to be considered:.
Answer:
1. Reading depth
2. Sphere power in the 90° meridian
3. Cylinder power in the 90° meridian
Question 30: Progressive power lenses require the following measurements in order to be accurately
fit:.
Answer: Monocular PD and monocular seg height.
Question 31: When the bottom of the eye-wire is inclined outward, further away from the face than the
top, it is called:.
Answer: Retroscopic tilt.
Question 32: Common plastic frame material used for eyeglass frames.
Answer: Zylonite, also known as Cellulose Acetate.
Page 3
, Question 33: A durable material that is injection molded, rather than cut from a flat sheet. Ideal for
wrap frames. Requires less heat for adjustments and lens insertion.
Answer: Cellulose Proprionate.
Question 34: Epoxy material that is lightweight. Cannot be overheated or burned, also it will not
shrink. "Memory".
Answer: Optyl
Question 35: Synthetic material from coal, water, and air. Light weight and very strong, often used in
children's frames and industrial safety eye- wear. Requires significant heat for lens insertion.
Answer: Nylon
Question 36: Strong, light weight, shape retention unaffected by heat. Resistant to scratching and made
nearly as thin as metal:.
Answer: Carbon fiber.
Question 37: Highly impact resistant frame, used for safety and sports:.
Answer: Polycarbonate frame
Question 38: Durable, light weight and flexible. Injection molded and holds colors very well. Material
will shrink when heated. Lenses must be cut to exact size.
Answer: Polymide/copolyamide
Question 39: Also used in bullet-proof vests and sports equipment because of its high tensile strength.
Injection molded and very strong.
Answer: Kevlar
Question 40: Made of special titanium and nickel alloy. Frames have memory.
Answer: Memory metal
Question 41: Holds shape the best of any metal combination. Not as malleable as some other materials,
often used for standard navigator and pilot shapes. The most popular metal for frames because it
accepts plating well and can be plated in many colors.
Answer: Nickel silver
Page 4
Question 1: Endothelium.
Answer: Cornea
Question 2: What are the layers of the cornea?
Answer: • Epithelium
Question 3: Total thickness of the cornea.
Answer: 0.50mm
Question 4: Thickest part of cornea (makes up 90%).
Answer: Stroma
Question 5: When a high powered minus lens is moved closer to the eye, the compensated power must:.
Answer: Be decreased.
Question 6: When a plus lens is moved closer to the eye, it's effective power:.
Answer: Decreases
Question 7: It is important to consider vertex distance in spectacle lenses when the power exceeds:.
Answer: ± 7.00 D
Question 8: Fused bifocals are available in:.
Answer: Flat top and Round
Question 9: In a round bifocal segment you find the optical center located:.
Answer: In the geometric center.
Question 10: The intermediate power most common in tri-focal lenses is:.
Answer: 50% of the add power
Question 11: Which bifocal segment contains the least amount of image jump?
Answer: Flat top
Page 1
,Question 12: What is the Index of refraction for Polycarbonate?
Answer: 1.586
Question 13: What is the index of refraction for Air:.
Answer: 1.0
Question 14: What is the index of refraction for Crown Glass?
Answer: 1.523
Question 15: What is the index of refraction for CR-39?
Answer: 1.490
Question 16: What is the index of refraction for Hi-index?
Answer: 1.60
Question 17: What is the index of refraction for Flint Glass?
Answer: 1.805
Question 18: What is the index of refraction for Titanium Glass?
Answer: 1.701
Question 19: How can cataract spectacle lenses be made?
Answer:
1. With
2. aspheric front surfaces
3. As lenticular designs
4. As full field lenses
Question 20: When compared to conventional spherical lenses, aspheric lenses are:.
Answer: Thinner and flatter with improved optics.
Question 21: The usefulness of cataract spectacle lenses can be improved by using:.
Answer: Aspheric front curves.
Question 22: How can aspheric lenses can by identified by manufacturers?
Answer: By referring to engraved ID markings.
Page 2
,Question 23: The minimum fitting height for most progressive addition lenses is:.
Answer: 22-25 mm, depending on the brand.
Question 24: The best candidates for progressive powered lenses are:.
Answer: Early presbyopes.
Question 25: Chromatic aberration is virtually nonexistent at the:.
Answer: Optical center
Question 26: A lens defect that bends light rays of different colors at different angles and focuses them
on different planes.
Answer: Chromatic Abberation
Question 27: "Conventional" slab-off is ground with base up prism in the reading portion only on the
lens with the ____________ in the vertical meridian.
Answer: Most minus / Least plus
Question 28: Bicentric grinding (slab-off) is generally prescribed for the correction of:.
Answer: Excessive prismatic imbalance at the reading level (vertical imbalance).
Question 29: When calculating vertical prismatic imbalance, all of the following need to be considered:.
Answer:
1. Reading depth
2. Sphere power in the 90° meridian
3. Cylinder power in the 90° meridian
Question 30: Progressive power lenses require the following measurements in order to be accurately
fit:.
Answer: Monocular PD and monocular seg height.
Question 31: When the bottom of the eye-wire is inclined outward, further away from the face than the
top, it is called:.
Answer: Retroscopic tilt.
Question 32: Common plastic frame material used for eyeglass frames.
Answer: Zylonite, also known as Cellulose Acetate.
Page 3
, Question 33: A durable material that is injection molded, rather than cut from a flat sheet. Ideal for
wrap frames. Requires less heat for adjustments and lens insertion.
Answer: Cellulose Proprionate.
Question 34: Epoxy material that is lightweight. Cannot be overheated or burned, also it will not
shrink. "Memory".
Answer: Optyl
Question 35: Synthetic material from coal, water, and air. Light weight and very strong, often used in
children's frames and industrial safety eye- wear. Requires significant heat for lens insertion.
Answer: Nylon
Question 36: Strong, light weight, shape retention unaffected by heat. Resistant to scratching and made
nearly as thin as metal:.
Answer: Carbon fiber.
Question 37: Highly impact resistant frame, used for safety and sports:.
Answer: Polycarbonate frame
Question 38: Durable, light weight and flexible. Injection molded and holds colors very well. Material
will shrink when heated. Lenses must be cut to exact size.
Answer: Polymide/copolyamide
Question 39: Also used in bullet-proof vests and sports equipment because of its high tensile strength.
Injection molded and very strong.
Answer: Kevlar
Question 40: Made of special titanium and nickel alloy. Frames have memory.
Answer: Memory metal
Question 41: Holds shape the best of any metal combination. Not as malleable as some other materials,
often used for standard navigator and pilot shapes. The most popular metal for frames because it
accepts plating well and can be plated in many colors.
Answer: Nickel silver
Page 4
