ABO, ABO Study Guide 2023/2024
QUESTIONS AND ANSWERS GRADED A+
Prentice Rule - ANS (Power x distance in mm) /10 Cornea index of refraction - ANS 1.37 Tear Film, Vitreous index of refraction - ANS 1.33 Crystalline lens index of refraction - ANS 1.42 Optical Standard index of refraction - ANS 1.53 Crown Glass index of refraction - ANS 1.523 High index of refraction - ANS 1.74 CR-39 index of refraction - ANS 1.49/1.50 Poly index of refraction - ANS 1.586 Air - ANS 1.00 How fast does light travel through air - ANS 186,000 mi/sec MBS formula - ANS ED+2 (decentration)+2 Focal length formula - ANS 1/Dioptic Power power Dioptic Power formula - ANS 1/Focal Length Antimetropia - ANS Rx with unlike signs in both eyes Anisometropia - ANS Difference of 2 diopters btwn OD & OS Anisiekonia - ANS When images from right and left eye are so different the brain can not achieve fusion What is the Radius of a 1 diopter curve? - ANS 530mm Radius formula - ANS 530/Power = Radius Power formula - ANS 530/Radius = Power Vertical Decentration formula - ANS Seg.ht. - B/2 How much HORIZONTAL prism tolerance is allowed? - ANS 2/3 of a diopter -or- 1 / 2
ABO, ABO Study Guide 2023/2024
QUESTIONS AND ANSWERS GRADED A+
0.667 How much VERTICAL prism tolerance is allowed? - ANS 1/3 of a diopter -or- 0.333 Base Curve tolerance - ANS +/-0.75 Sphere Tolerance up to 6.50 - ANS +/- 0.13 Sphere Tolerance above 6.50 - ANS +/- 2% Cylinder Tolerance >1.50 - ANS +/-2° Cylinder Tolerance >0.50 / less than or equal to 1.50 - ANS +/-3° Cylinder Tolerance >0.25 / less than or equal to 0.50 - ANS +/-7° Cylinder Tolerance >0.00 / less than or equal to 0.25 - ANS +/-14° Drop ball test for Safety lenses - ANS 5/8ths in diameter, weighing 0.56oz dropped 50ft Frame PD - ANS A box + DBL Total decentration - ANS Frame PD - Patient PD Base IN (MINUS) - ANS If frame PD is GREATER than customer PD Base OUT (MINUS) - ANS If frame PD is LESS than customer PD Which layer of the cornea is highly regenerative? - ANS Epithelium Which area of the retina is capable of perceiving the greatest amount of detail? - ANS Fovea centralis Tonometer - ANS Used for intraocular pressure What is another name for Lensometer? - ANS Focimeter Thickest layer of the cornea - ANS Stroma What is the main focusing structure of the eye - ANS Ciliary process
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