Final answer:
True, the definition of an eye not only includes the ability to sense light but also to detect the direction of light, allowing for image processing.
Step-by-step explanation:
The statement that the minimum criterion for calling something an eye, rather than a photoreceptor, is the ability to detect the direction from which light has entered the organ is true. An eye is not just a structure that senses light, but it also interprets the direction from which the light enters, to allow for processing of images. The human eye is composed of various parts including the cornea, pupil, iris, lens, and retina. The light first passes through the cornea, which is the clear outer layer that protects the eye and then enters the eye through the pupil. The size of the pupil is controlled by the iris, based on the brightness of the light. The light is then focused by the lens onto the retina, which contains photoreceptor cells such as rods and cones that convert light into nerve impulses. These impulses are carried to the brain by the optic nerve.