The specialty lens cycle.
Koetting
R A
RA
D001291:Attitude of Health Personnel; D003261:Contact Lenses / Q000191:economics / Q000706:statistics & numerical data / Q000639:trends*; D005260:Female; D006801:Humans; D008297:Male; D009907:Optometry / Q000191:economics / Q000639:trends; D011305:Presbyopia / Q000628:therapy