Caption: An illustration of Snell's Law, showing how light is refracted when traveling from one mediums to another
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 30.15 MB

Caption: Myopia, or nearsightedness, can be corrected with concave lenses to allow near objects to be brought into focus by the eye.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 8.19 MB

Caption: Hyperopia, or farsightedness, can be corrected with convex lenses to reduce the eye's effort to bring an object into focus.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 8.19 MB

Caption: Steps in the evolution of the eye as reflected in the range of eye complexity in various living mollusk species.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 17.91 MB

Caption: Astigmatism results from a nonuniform curvature of the cornea that produces distorted vision.
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 8.19 MB