ACOD Workshop 2

According to toric expression, the number on the bottom left side of the expression represents

• The cross curve on the back surface

• The base curve on the back surface

• The sphere curve on the front surface

• The base curve on the front surface

A prescription reads -2.50 / -1.75 x 60. The type of astigmatism corrected by this prescription is

• Mixed astigmatism

• Simple myopic astigmatism

• Compound myopic astigmatism

• Compound hyperopic astigmatism

A lens prescription reads -3.00 / -1.75 x 45. The 45 represents:

• The sphere power of the prescription

• The axis of the prescription

• The cylinder power of the prescription

• 
  

  The prism power of the prescription

A lens prescription reads -3.00 / -1.50 x 180. The principal powers are

• • -3.00 and -4.50

• -1.50 and -4.50

• -3.00 and 180

• 
  

  -3.00 and -1.50

Standard Axis Notation operates from 0º to 180º and involves

• Right to left movement

• Clockwise rotation

• 
  

  Left to right movement

• Anti-clockwise rotation

Which of the following dispensing options could be recommended to the customer to help reduce the thickness of a lens with prism:

• Divide the prism equally between the eyes

• 
  Splay the nose pad adjustment

• Tint

• Two pairs of spectacles

The term ”hypertropia” refers to:

• 
  

  An eye that has a constant outward turn

• 
  

  An eye that has a constant downward turn

• An eye that has a tendency to turn inwards turn

• An eye that has a constant upward turn

Prentice’s Rule can be used to calculate

• 
  How much prism the wearer experiences when they take off their spectacles

• How much prism is induced when the wearer uses their spectacles indoors

• How much sphere power is induced when the wearer looks through the lens optical centre

• How much prism in induced when the wearer looks away from the lens optical centre

DPE stands for:

• Differential Prismatic Edge

• Double Polarising Effect

• Differential Prismatic Effect

• Different Prism Eyepiece

The thickest part of an ophthalmic prism is found at

• The centre of the prism

• The base of the prism

• The top of the prism

• The apex of the prism