Columbia subject headings:
Color vision.
Eye--Refractive errors.
Eye--Wounds and injuries.
Eye.
Optical illusions.
Vision.
Harvard subject headings:
Color vision.
Eye--Refractive errors
Eye--Wounds and injuries
Eye.
Optical illusions.
Vision.
Visual pathways
Visual perception.
Princeton subject headings:
Eye.
Vision.
Visual pathways.
Visual perception.