Which of the following is a routine examination before refractive surgery（）
A. Refractive status
B. Corneal thickness measurement
C. Pupil diameter measurement
D. All of the above
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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
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
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