Columbia subject headings:
Harvard subject headings:
Electrodiagnosis--Congresses.
Eye--Examination--Congresses.
Eye--Refractive errors--Diagnosis--Congresses.
Physiological optics--Congresses.
Princeton subject headings:
Electrodiagnosis--Congresses.
Eye--Examination--Congresses.
Eye--Refractive errors--Diagnosis--Congresses.
Physiological optics--Congresses.