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ABO STUDY GUIDE 2024/2025

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ABO STUDY GUIDE 2024/2025 Prentice Rule - ️️ - (Power x distance in mm) /10 Cornea index of refraction - ️️ - 1.37 Tear Film, Vitreous index of refraction - ️️ - 1.33 Crystalline lens index of refraction - ️️ - 1.42 Optical Standard index of refraction - ️️ - 1.53 Crown Gl...

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  • June 2, 2024
  • 16
  • 2023/2024
  • Exam (elaborations)
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  • ABO
  • ABO
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MERCYTRISHIA
ABO STUDY GUIDE 2024/2025

Prentice Rule - ✔️✔️- (Power x distance in mm) /10

Cornea index of refraction - ✔️✔️- 1.37

Tear Film, Vitreous index of refraction - ✔️✔️- 1.33

Crystalline lens index of refraction - ✔️✔️- 1.42

Optical Standard index of refraction - ✔️✔️- 1.53

Crown Glass index of refraction - ✔️✔️- 1.523

High index of refraction - ✔️✔️- 1.74

CR-39 index of refraction - ✔️✔️- 1.49/1.50

Poly index of refraction - ✔️✔️- 1.586

Air - ✔️✔️- 1.00

How fast does light travel through air - ✔️✔️- 186,000 mi/sec

MBS formula - ✔️✔️- ED+2 (decentration)+2

Focal length formula - ✔️✔️- 1/Dioptic Power power

Dioptic Power formula - ✔️✔️- 1/Focal Length

Antimetropia - ✔️✔️- Rx with unlike signs in both eyes

Anisometropia - ✔️✔️- Difference of 2 diopters btwn OD & OS

Anisiekonia - ✔️✔️- 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? - ✔️✔️- 530mm

,Radius formula - ✔️✔️- 530/Power = Radius

Power formula - ✔️✔️- 530/Radius = Power

Vertical Decentration formula - ✔️✔️- Seg.ht. - B/2

How much HORIZONTAL prism tolerance is allowed? - ✔️✔️- 2/3 of a diopter

-or-

0.667

How much VERTICAL prism tolerance is allowed? - ✔️✔️- 1/3 of a diopter

-or-

0.333

Base Curve tolerance - ✔️✔️- +/-0.75

Sphere Tolerance up to 6.50 - ✔️✔️- +/- 0.13

Sphere Tolerance above 6.50 - ✔️✔️- +/- 2%

Cylinder Tolerance >1.50 - ✔️✔️- +/-2°

Cylinder Tolerance >0.50 / less than or equal to 1.50 - ✔️✔️- +/-3°

Cylinder Tolerance >0.25 / less than or equal to 0.50 - ✔️✔️- +/-7°

Cylinder Tolerance >0.00 / less than or equal to 0.25 - ✔️✔️- +/-14°

Drop ball test for Safety lenses - ✔️✔️- 5/8ths in diameter, weighing 0.56oz dropped

50ft

Frame PD - ✔️✔️- A box + DBL

Total decentration - ✔️✔️- Frame PD - Patient PD

Base IN (MINUS) - ✔️✔️- If frame PD is GREATER than customer PD

, Base OUT (MINUS) - ✔️✔️- If frame PD is LESS than customer PD

Which layer of the cornea is highly regenerative? - ✔️✔️- Epithelium

Which area of the retina is capable of perceiving the greatest amount of detail? - ✔️✔️-

Fovea centralis

Tonometer - ✔️✔️- Used for intraocular pressure

What is another name for Lensometer? - ✔️✔️- Focimeter

Thickest layer of the cornea - ✔️✔️- Stroma

What is the main focusing structure of the eye - ✔️✔️- Ciliary process

Emetropic - ✔️✔️- Perfect Vision

Ametropic - ✔️✔️- Needs correction

Thindex glass - ✔️✔️- 1.8

High light glass - ✔️✔️- 1.74

Flint glass - ✔️✔️- 1.69

3 eye layers/tunics - ✔️✔️- Layer #1- Protective

Layer #2- Nourishing

Later #3- Light Sensitive

Cellulose Acetate (Zyle) - ✔️✔️- Non-flammable, durable, avail in diff colors

Layer #1 - ✔️✔️- Sclera, Cornea, Anterior Chamber

Layer 2 - ✔️✔️- Choroid, Ciliary Body, Iris, Crystalline Lens

Layer 3 - ✔️✔️- Retina, Rods & Cones

Red - ✔️✔️- 651-750

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