ABO ACTUAL ASSESSMENT SCRIPT Questions with Correct
Answers (Grade A+)
Question 1: Cornea index of refraction.
Answer: 1.37
Question 2: Tear Film, Vitreous index of refraction.
Answer: 1.33
Question 3: Crystalline lens index of refraction.
Answer: 1.42
Question 4: Optical Standard index of refraction.
Answer: 1.53
Question 5: Crown Glass index of refraction.
Answer: 1.523
Question 6: High index of refraction.
Answer: 1.74
Question 7: CR-39 index of refraction.
Answer: 1.49/1.50
Question 8: Poly index of refraction.
Answer: 1.586
Question 9: Air.
Answer: 1.00
Question 10: How fast does light travel through air.
Answer: 186,000 mi/sec
Question 11: MBS formula.
Answer: ED+2 (decentration)+2
Page 1
,Question 12: Focal length formula.
Answer: 1/Dioptic Power power
Question 13: Dioptic Power formula.
Answer: 1/Focal Length
Question 14: Antimetropia.
Answer: Rx with unlike signs in both eyes
Question 15: Anisometropia.
Answer: Difference of 2 diopters btwn OD & OS
Question 16: When images from right and left eye are so different the brain can not achieve fusion
Answer: Anisiekonia.
Question 17: What is the Radius of a 1 diopter curve?
Answer: 530mm
Question 18: Radius formula.
Answer: 530/Power = Radius
Question 19: Power formula.
Answer: 530/Radius = Power
Question 20: Vertical Decentration formula.
Answer: Seg.ht. - B/2
Question 21: How much HORIZONTAL prism tolerance is allowed?
Answer:
1. 2/3 of a diopter
2. or-
3. 667
Page 2
, Question 22: How much VERTICAL prism tolerance is allowed?
Answer:
1. 1/3 of a diopter
2. or-
3. 333
Question 23: Base Curve tolerance.
Answer: +/-0.75
Question 24: Sphere Tolerance up to 6.50.
Answer: +/- 0.13
Question 25: Sphere Tolerance above 6.50.
Answer: +/- 2%
Question 26: Cylinder Tolerance >1.50.
Answer: +/-2°
Question 27: Cylinder Tolerance >0.50 / less than or equal to 1.50.
Answer: +/-3°
Question 28: Cylinder Tolerance >0.25 / less than or equal to 0.50.
Answer: +/-7°
Question 29: Cylinder Tolerance >0.00 / less than or equal to 0.25.
Answer: +/-14°
Question 30: Drop ball test for Safety lenses.
Answer: 5/8ths in diameter, weighing 0.56oz dropped 50ft
Question 31: Frame PD.
Answer: A box + DBL
Question 32: Total decentration.
Answer: Frame PD - Patient PD
Page 3
Answers (Grade A+)
Question 1: Cornea index of refraction.
Answer: 1.37
Question 2: Tear Film, Vitreous index of refraction.
Answer: 1.33
Question 3: Crystalline lens index of refraction.
Answer: 1.42
Question 4: Optical Standard index of refraction.
Answer: 1.53
Question 5: Crown Glass index of refraction.
Answer: 1.523
Question 6: High index of refraction.
Answer: 1.74
Question 7: CR-39 index of refraction.
Answer: 1.49/1.50
Question 8: Poly index of refraction.
Answer: 1.586
Question 9: Air.
Answer: 1.00
Question 10: How fast does light travel through air.
Answer: 186,000 mi/sec
Question 11: MBS formula.
Answer: ED+2 (decentration)+2
Page 1
,Question 12: Focal length formula.
Answer: 1/Dioptic Power power
Question 13: Dioptic Power formula.
Answer: 1/Focal Length
Question 14: Antimetropia.
Answer: Rx with unlike signs in both eyes
Question 15: Anisometropia.
Answer: Difference of 2 diopters btwn OD & OS
Question 16: When images from right and left eye are so different the brain can not achieve fusion
Answer: Anisiekonia.
Question 17: What is the Radius of a 1 diopter curve?
Answer: 530mm
Question 18: Radius formula.
Answer: 530/Power = Radius
Question 19: Power formula.
Answer: 530/Radius = Power
Question 20: Vertical Decentration formula.
Answer: Seg.ht. - B/2
Question 21: How much HORIZONTAL prism tolerance is allowed?
Answer:
1. 2/3 of a diopter
2. or-
3. 667
Page 2
, Question 22: How much VERTICAL prism tolerance is allowed?
Answer:
1. 1/3 of a diopter
2. or-
3. 333
Question 23: Base Curve tolerance.
Answer: +/-0.75
Question 24: Sphere Tolerance up to 6.50.
Answer: +/- 0.13
Question 25: Sphere Tolerance above 6.50.
Answer: +/- 2%
Question 26: Cylinder Tolerance >1.50.
Answer: +/-2°
Question 27: Cylinder Tolerance >0.50 / less than or equal to 1.50.
Answer: +/-3°
Question 28: Cylinder Tolerance >0.25 / less than or equal to 0.50.
Answer: +/-7°
Question 29: Cylinder Tolerance >0.00 / less than or equal to 0.25.
Answer: +/-14°
Question 30: Drop ball test for Safety lenses.
Answer: 5/8ths in diameter, weighing 0.56oz dropped 50ft
Question 31: Frame PD.
Answer: A box + DBL
Question 32: Total decentration.
Answer: Frame PD - Patient PD
Page 3
