_______ reacts to light to start the process of transduction.
A) Opsin
B) Retinal
C) Choroid
D) Thyric acid
The visual pigment molecules are contained in the _____.
A) inner segments of the visual receptors
B) outer segments of the visual receptors
C) axons of the rods
D) axons of the cones
Vera has hyperopia, and tends to get headaches when she reads. This might be because _____.
A) Vera also has presbyopia and has the constant need to accommodate
B) Vera also has myopia and is unable to accommodate
C) Vera has just had LASIK surgery and her ciliary muscles are damaged
D) Vera is 5-years-old and lacks the visual acuity to read
Individuals with myopia may have difficulty seeing _____ objects clearly. Often times, they are also referred to as being _____.
A) nearby; farsighted
B) nearby; nearsighted
C) distant; farsighted
D) distant; nearsighted
In _____, the eyeball is too long, resulting in difficulty seeing far objects.
A) axial myopia
B) refractive myopia
C) axial hyperopia
D) refractive hyperopia
Lorelei's mother is 60 years old, and, because of the condition called _____, she has a difficult time bringing near objects into focus.
A) cataracts
B) diplopia
C) presbyopia
D) retinitis pigmentosa
The ciliary muscles change the shape of the _____, providing about 20 of the eye's focusing power.
A) iris
B) pupil
C) cornea
D) lens
Jan tries to focus on the tip of her pencil as she brings it closer to her. She feels the strain on her eye as she does this. What she is feeling in her eye is due to the process called _____.
A) inhibition
B) reflection
C) accommodation
D) assimilation
The structure of the eye that provides about 80 of the eye's focusing power is the _____.
A) iris
B) pupil
C) cornea
D) lens
The electromagnetic spectrum is a continuum of electromagnetic energy that is produced by _____ and is radiated as _____.
A) electric charges; waves
B) magnetism; waves
C) electric charges; magnetism
D) magnetism; electric charges
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