Refractive Errors and Types of Corrective Lenses Practice Unit Assessment (Spring '25 VT 2 of 4)

The patient normally has no need for any visual correction for distance, but does require prescription lenses to see well at near. This patient's refractive error is known as

• Myopia
• Hyperopia
• Presbyopia
• Mixed Astigmatism

Accommodation is defined as _____________

• Light rays entering the eye
• The act of the Crystalline lens changing it's shapre to focus for objects at varying distances
• The refractive power of the Cornea
• Reductions of visual acuity with no apparent cause

Examine the photo. Which refractive error is this an example of ?

• Astigmatism
• Hyperopia
• Myopia
• Amblyopia

Examine the photo and identify the type of Astigmatism

• Compound Hyperopia Astigmatism
• Simple Hyperopia Astigmatism
• Mixed Hyperopia Astigmatism
• Mixed Astigmatism

Examine the photo and identify the type of Astigmatism

• Simple Hyperopia Astigmatism
• Simple Myopic Astigmatism
• Myopia - There's no Astigmatism
• Compound Myopic Astigmatism

In Simple Hyperopic Astigmatism, one point comes to focus on the Retina while the other point comes to focus after the Retina

• True
• False

One of the ways of identifying a lens with minus power is to look for:

• Parallel rays of light coming to a point of focuse behind the ophthalmic lens
• Lens thicker in the center than the edge
• Objects seen through the lens are brighter
• Objects seen through the lens seem to move in the same direction as the lens is moving

Eyeglass prescription powers are written in _________.

• Axis
• Prisms
• Diopters
• Degrees

To switch between minus and plus cylinder forms we use _____.

• Cylinder Conversion
• Cylinder Powers Formula
• Transposition
• Degree Conversion

A myope always has in his or her prescription the following kind of power:

• Minus Power
• Plus Power
• Cylinder Power
• Axis