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Images

Figure 2: Influence of the environment on the optical arrangements of animal eyes (see text).

Figure 1: General structure of the mammalian eye.

Discover

The Castillo, a Toltec-style pyramid, rises 79 feet (24 meters) above the plaza at Chichen Itza in Yucatan state, Mexico. The pyramid was built after invaders conquered the ancient Maya city in the tenth century.

What’s Inside the Pyramid at Chichén Itzá?

The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

The Lost Colony of Roanoke

An old worn baseball and wood bat

Who Really Invented Baseball?

Close-up of crocodile eye; location unknown (rainforest, reptile).

What’s the Difference Between Alligators and Crocodiles?

Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

Ancient Mayan Calendar

Our Days Are Numbered: 7 Crazy Facts About Calendars

earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.

The 6 Deadliest Earthquakes Since 1950

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Photos

Figure 2: Influence of the environment on the optical arrangements of animal eyes (see text).

Figure 1: General structure of the mammalian eye.

See All Images →

Topics

cataract focusing presbyopia lens dislocation eyeball cornea aqueous humour retina pupil

Dig Deeper: More Articles That Discuss This Topic

human eye: The nature of eye movements

Key People

George Wald

American biochemist