ABO FINAL PAPER 2026 QUESTIONS AND
SOLUTIONS 100% CORRECT
◉These layers are in:
• Epithelium
• Bowman's membrane
• Stroma
• Desemet's membrane
• Endothelium. Answer: Cornea
◉What are the layers of the cornea?. Answer: • Epithelium
• Bowman's membrane
• Stroma
• Desemet's membrane
• Endothelium
◉Total thickness of the cornea.. Answer: 0.50mm
,◉Thickest part of cornea (makes up 90%).. Answer: Stroma
◉When a high powered minus lens is moved closer to the eye, the
compensated power must:. Answer: Be decreased.
◉When a plus lens is moved closer to the eye, it's effective power:.
Answer: Decreases
◉It is important to consider vertex distance in spectacle lenses
when the power exceeds:. Answer: ± 7.00 D
◉Fused bifocals are available in:. Answer: Flat top and Round
◉In a round bifocal segment you find the optical center located:.
Answer: In the geometric center.
◉The intermediate power most common in tri-focal lenses is:.
Answer: 50% of the add power
◉Which bifocal segment contains the least amount of image jump?.
Answer: Flat top
◉What is the Index of refraction for Polycarbonate?. Answer: 1.586
,◉What is the index of refraction for Air:. Answer: 1.0
◉What is the index of refraction for Crown Glass?. Answer: 1.523
◉What is the index of refraction for CR-39?. Answer: 1.490
◉What is the index of refraction for Hi-index?. Answer: 1.60
◉What is the index of refraction for Flint Glass?. Answer: 1.805
◉What is the index of refraction for Titanium Glass?. Answer: 1.701
◉How can cataract spectacle lenses be made?. Answer: 1. With
aspheric front surfaces
2. As lenticular designs
3. As full field lenses
◉When compared to conventional spherical lenses, aspheric lenses
are:. Answer: Thinner and flatter with improved optics.
, ◉The usefulness of cataract spectacle lenses can be improved by
using:. Answer: Aspheric front curves.
◉How can aspheric lenses can by identified by manufacturers?.
Answer: By referring to engraved ID markings.
◉The minimum fitting height for most progressive addition lenses
is:. Answer: 22-25 mm, depending on the brand.
◉The best candidates for progressive powered lenses are:. Answer:
Early presbyopes.
◉Chromatic aberration is virtually nonexistent at the:. Answer:
Optical center
◉A lens defect that bends light rays of different colors at different
angles and focuses them on different planes.. Answer: Chromatic
Abberation
◉"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
SOLUTIONS 100% CORRECT
◉These layers are in:
• Epithelium
• Bowman's membrane
• Stroma
• Desemet's membrane
• Endothelium. Answer: Cornea
◉What are the layers of the cornea?. Answer: • Epithelium
• Bowman's membrane
• Stroma
• Desemet's membrane
• Endothelium
◉Total thickness of the cornea.. Answer: 0.50mm
,◉Thickest part of cornea (makes up 90%).. Answer: Stroma
◉When a high powered minus lens is moved closer to the eye, the
compensated power must:. Answer: Be decreased.
◉When a plus lens is moved closer to the eye, it's effective power:.
Answer: Decreases
◉It is important to consider vertex distance in spectacle lenses
when the power exceeds:. Answer: ± 7.00 D
◉Fused bifocals are available in:. Answer: Flat top and Round
◉In a round bifocal segment you find the optical center located:.
Answer: In the geometric center.
◉The intermediate power most common in tri-focal lenses is:.
Answer: 50% of the add power
◉Which bifocal segment contains the least amount of image jump?.
Answer: Flat top
◉What is the Index of refraction for Polycarbonate?. Answer: 1.586
,◉What is the index of refraction for Air:. Answer: 1.0
◉What is the index of refraction for Crown Glass?. Answer: 1.523
◉What is the index of refraction for CR-39?. Answer: 1.490
◉What is the index of refraction for Hi-index?. Answer: 1.60
◉What is the index of refraction for Flint Glass?. Answer: 1.805
◉What is the index of refraction for Titanium Glass?. Answer: 1.701
◉How can cataract spectacle lenses be made?. Answer: 1. With
aspheric front surfaces
2. As lenticular designs
3. As full field lenses
◉When compared to conventional spherical lenses, aspheric lenses
are:. Answer: Thinner and flatter with improved optics.
, ◉The usefulness of cataract spectacle lenses can be improved by
using:. Answer: Aspheric front curves.
◉How can aspheric lenses can by identified by manufacturers?.
Answer: By referring to engraved ID markings.
◉The minimum fitting height for most progressive addition lenses
is:. Answer: 22-25 mm, depending on the brand.
◉The best candidates for progressive powered lenses are:. Answer:
Early presbyopes.
◉Chromatic aberration is virtually nonexistent at the:. Answer:
Optical center
◉A lens defect that bends light rays of different colors at different
angles and focuses them on different planes.. Answer: Chromatic
Abberation
◉"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
