Which of the following is not spectacles（）
A. Single vision glasses
Bifocal glasses
C. Progressive multifocal lenses
D. Orthokeratology lenses
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In the lens selection, which one is first recommended（）
A. Glass
B. Plastic lenses
C. PC lenses
D. None of the above
Myopic lens is（）
A. Convex lens
B. Concave lens
C. Plain glass
D. None of the above
Precautions for myopia include（）
A. Create a profile of refractive development
B. Increase outdoor activities
C. Prohibit the use of electronic devices
D. Scientific indoor lighting
E. Proper close work
Where is the external parallel light focused after passing through the myopic eye（）
A. Before the retina
B. Right on the retina
C. After the retina
D. None of the above
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