The Orthokeratology flattens the cornea, changing the（）of light entering the eye and focusing the light on the retina
A. wavelength
B. refractive power
C. velocity
D. reflectivity
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Refractive surgery includes（）
A. Corneal refractive surgery
B. Iris refractive surgery
C. Intraocular refractive surgery
D. Extraocular refractive surgery
Which of the following is not spectacles（）
A. Single vision glasses
Bifocal glasses
C. Progressive multifocal lenses
D. Orthokeratology lenses
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
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