abo exam
-2.50-0.50x180 - the three closely spaced parallel lines come into sharp focus when the power
drum reads -2.50D and the axis wheel is set at 180 degrees. in order to bring the three widely spaced
lines into focus, the power drum must be moved to read -3.00D. prescription?
1.0 prism diopters base in - Rx: 2.50 - 0.50 x 180 +2.50 sph PD = 67 During final inspection, it was
determined that the optical centers of the lenses were placed 63 mm apart. How much total prism will
this produce, and in whihc direction is the base?
- Lacrimal Puncta: - (NOT REALLY VISIBLE IN
IMAGE): Small openings (pores) located at the
medial canthus that allow the accumulated tears to
drain off the eye. The tears drain through the nasal
cavity which is why when you cry your nose runs!
- Lateral Canthus: - This is the point where the
upper and lower eyelids meet towards your ear.
- Medial Canthus: - This is the point where the
upper and lower eyelids meet near the nose. In layman
terms, "the corner of your eye."
- Ocular or Bulbar Conjunctiva: - The layer that
covers the exposed portions of the eye
- Palpebral Conjunctiva: - The layer that covers the
eyelids.
,-0.75-0.75x30 - Rx: -2.00-0.75x30 add +2.50 if this lens was made utilizing a standard trifocal
design, what would be the power through the intermediate portion?
-2.50 +2.50 x 180 - the power of a compound lens in any given meridian will vary as the axis of the
cylinder changes. which of the following lenses contain no power in the ninety degree meridian?
-20 cm - the focal length of a -5.00 diopter lens is:
-4.25 D - A +1.75 diopter lens fabricated with a +6.00 base curve will require a back curve of:
+/- 0.13D - ansi standard cylinder power 0.00D-2.00D
+/- 0.13D - ansi standard for distance sphere power 0.00D-6.50D
+/- 0.75 D - according to ANSI standards, the base curve received must be within ___________ of
that specified.
+/- 14 degrees - ansi standard cylinder axis 0.00D-0.25D
+/- 2 degrees - ansi standard cylinder axis over 1.50D
+/- 2.0 deg - a lens containing over 1.50 D of cylinder must be within __________________ of the
specified axis.
+/- 2% of power - ansi standard for distance sphere power over 6.50D
+/- 3 degrees - ansi standard cylinder axis 0.75D-1.50D
+/- 4% of the power - ansi standard cylinder power over 4.50D
,+/- 5 degrees - ansi standard cylinder axis 0.50D-0.75D
+/- 7 degrees - ansi standard cylinder axis 0.25D-0.50D
+/- 7.0 deg - according to ANSI standards, a lens containing 0.25 D of cylinder must be within
_______________ of the specified axis.
+/- 7.00 - glass lenses in which the power exceeds _____________ diopters should generally not
be heat treated.
+/- 7.00 D - it is important to consider vertex distance in spectacle lenses when the power
exceeds:
+/-0.15D - ansi standard cylinder power 2.00D-4.50D
+0.50 diopters - if a converging lens has a focal length of +2 meters, its power is:
+10.50 - a +10.00 diopter lens is fit at a 14 mm vertex distance. a new frame is selected which
positions the back surface of the lens 9 mm from the cornea. the power of the new lens needed to
compensate for the change in vertex distance is:
+100 + 0.50 x 180 - a pair of crossed cylinders, +100 x 90 and +150 x 180 would produce a power
of:
+100 cm - the focal length of a +1.00 diopter lens is:
+5.00-1.00x120
+4.75-0.75x110 - Rx: +2.75-1.00x120
+2.50-0.75x110
, add +2.25
the patient has requested a pair of single vision lenses to use exclusively for reading at the near point.
what will be the power of these lenses?
0.25 - How much prism is induced 10 mm away from the optical center of a -0.25 diopter lens?
0.50 prism diopters base out - If the Rx -3.00 + 0.50 x 90 is decentered 2mm too much, how much
prism will be created, and in which direction is the base?
- Fornix - (NOT REALLY VISIBLE IN IMAGE): Actual location is behind the eyelid or palpebra and
along the sclera. It is where the two layers of the conjunctiva meet and join
0.6 prism diopters base in - a pair of spectacles were ordered with a prescription of -2.00D in each
eye and a PD of 63 mm. they were received from the lab with the optical centers set 66mm apart. how
much total prism was induced and in which direction is the base?
0.8 prism diopters base out - a pair of +4.00 spectacle lenses were ordered from the laboratory
with a PD of 59 mm. when these lenses were verified, it was determined that the optical centers were
positioned 4mm too wide. how much prism was induced in each eye and in which direction is the base?
0.9 BASE OUT - came in with the optical centers positioned 61 mm apart. The work order
indicates the patient's PD measures 64 mm and the prescription calls fro a -3.00 spheres in each eye.
How much total prism is induced and in which direction is the base?
1 mm for every 2 degrees - optical center should be vertically below pupil __________ for every
__________ of pantoscopic tilt.
1 prism diopter - if a prism can displace an image one centimeter at a distance of one meter, it is
said to have a power of:
1 prism diopter=1cm/1m - prism diviation of light formula
1. The dilator muscle which opens the iris allowing more light in
2. The sphincter muscle which closes the iris - the 2 iris muscles
-2.50-0.50x180 - the three closely spaced parallel lines come into sharp focus when the power
drum reads -2.50D and the axis wheel is set at 180 degrees. in order to bring the three widely spaced
lines into focus, the power drum must be moved to read -3.00D. prescription?
1.0 prism diopters base in - Rx: 2.50 - 0.50 x 180 +2.50 sph PD = 67 During final inspection, it was
determined that the optical centers of the lenses were placed 63 mm apart. How much total prism will
this produce, and in whihc direction is the base?
- Lacrimal Puncta: - (NOT REALLY VISIBLE IN
IMAGE): Small openings (pores) located at the
medial canthus that allow the accumulated tears to
drain off the eye. The tears drain through the nasal
cavity which is why when you cry your nose runs!
- Lateral Canthus: - This is the point where the
upper and lower eyelids meet towards your ear.
- Medial Canthus: - This is the point where the
upper and lower eyelids meet near the nose. In layman
terms, "the corner of your eye."
- Ocular or Bulbar Conjunctiva: - The layer that
covers the exposed portions of the eye
- Palpebral Conjunctiva: - The layer that covers the
eyelids.
,-0.75-0.75x30 - Rx: -2.00-0.75x30 add +2.50 if this lens was made utilizing a standard trifocal
design, what would be the power through the intermediate portion?
-2.50 +2.50 x 180 - the power of a compound lens in any given meridian will vary as the axis of the
cylinder changes. which of the following lenses contain no power in the ninety degree meridian?
-20 cm - the focal length of a -5.00 diopter lens is:
-4.25 D - A +1.75 diopter lens fabricated with a +6.00 base curve will require a back curve of:
+/- 0.13D - ansi standard cylinder power 0.00D-2.00D
+/- 0.13D - ansi standard for distance sphere power 0.00D-6.50D
+/- 0.75 D - according to ANSI standards, the base curve received must be within ___________ of
that specified.
+/- 14 degrees - ansi standard cylinder axis 0.00D-0.25D
+/- 2 degrees - ansi standard cylinder axis over 1.50D
+/- 2.0 deg - a lens containing over 1.50 D of cylinder must be within __________________ of the
specified axis.
+/- 2% of power - ansi standard for distance sphere power over 6.50D
+/- 3 degrees - ansi standard cylinder axis 0.75D-1.50D
+/- 4% of the power - ansi standard cylinder power over 4.50D
,+/- 5 degrees - ansi standard cylinder axis 0.50D-0.75D
+/- 7 degrees - ansi standard cylinder axis 0.25D-0.50D
+/- 7.0 deg - according to ANSI standards, a lens containing 0.25 D of cylinder must be within
_______________ of the specified axis.
+/- 7.00 - glass lenses in which the power exceeds _____________ diopters should generally not
be heat treated.
+/- 7.00 D - it is important to consider vertex distance in spectacle lenses when the power
exceeds:
+/-0.15D - ansi standard cylinder power 2.00D-4.50D
+0.50 diopters - if a converging lens has a focal length of +2 meters, its power is:
+10.50 - a +10.00 diopter lens is fit at a 14 mm vertex distance. a new frame is selected which
positions the back surface of the lens 9 mm from the cornea. the power of the new lens needed to
compensate for the change in vertex distance is:
+100 + 0.50 x 180 - a pair of crossed cylinders, +100 x 90 and +150 x 180 would produce a power
of:
+100 cm - the focal length of a +1.00 diopter lens is:
+5.00-1.00x120
+4.75-0.75x110 - Rx: +2.75-1.00x120
+2.50-0.75x110
, add +2.25
the patient has requested a pair of single vision lenses to use exclusively for reading at the near point.
what will be the power of these lenses?
0.25 - How much prism is induced 10 mm away from the optical center of a -0.25 diopter lens?
0.50 prism diopters base out - If the Rx -3.00 + 0.50 x 90 is decentered 2mm too much, how much
prism will be created, and in which direction is the base?
- Fornix - (NOT REALLY VISIBLE IN IMAGE): Actual location is behind the eyelid or palpebra and
along the sclera. It is where the two layers of the conjunctiva meet and join
0.6 prism diopters base in - a pair of spectacles were ordered with a prescription of -2.00D in each
eye and a PD of 63 mm. they were received from the lab with the optical centers set 66mm apart. how
much total prism was induced and in which direction is the base?
0.8 prism diopters base out - a pair of +4.00 spectacle lenses were ordered from the laboratory
with a PD of 59 mm. when these lenses were verified, it was determined that the optical centers were
positioned 4mm too wide. how much prism was induced in each eye and in which direction is the base?
0.9 BASE OUT - came in with the optical centers positioned 61 mm apart. The work order
indicates the patient's PD measures 64 mm and the prescription calls fro a -3.00 spheres in each eye.
How much total prism is induced and in which direction is the base?
1 mm for every 2 degrees - optical center should be vertically below pupil __________ for every
__________ of pantoscopic tilt.
1 prism diopter - if a prism can displace an image one centimeter at a distance of one meter, it is
said to have a power of:
1 prism diopter=1cm/1m - prism diviation of light formula
1. The dilator muscle which opens the iris allowing more light in
2. The sphincter muscle which closes the iris - the 2 iris muscles
