A Person Can See Well Close Up, but Cannot Do

question 30

Multiple Choice

A person can see well close up, but cannot do so in the distance. To correct this, lenses that are _____ having a _____ refractive power could be used.

• A) thicker at their center than at the edges, positive
• B) thicker at their center than at the edges, negative
• C) thinner at their center than at the edges, negative
• D) thinner at their center than at the edges, positive

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Definitions:

Sphenoid

A butterfly-shaped bone at the base of the skull, part of the cranium, and contains the sphenoid sinus.

Ethmoid

A porous bone located between the eyes and forming part of the nasal cavity and the eye sockets.

Zygomatic

Pertaining to the cheekbone or zygoma, which is a bone that forms part of the orbit of the eye and the cheek.

Temporal

Pertaining to the temporal bone of the skull, near the temples, and involved in hearing and balance.