The Tropic of Cancer and The Tropic of Capricorn. The Tropic of Cancer and the Tropic of Capricorn each lie at 23.5 degrees latitude. The Tropic of Cancer is located at 23.5Â° North of the equator and runs through Mexico, the Bahamas, Egypt, Saudi Arabia, India, and southern China.
Dr. Elliot Werner: Neither. Halos indicate something in the transparent structures of the eye that is interfering with the transmission of light back to the retina. The most common causes of halos are corneal edema (swelling), cataract, and high humidity in the air.
Key Points. 1  Usually doctors can determine the cause of eye pain during an examination. 2  People with severe pain, eye redness, or warning signs (vomiting, halos around lights, fever, decreased visual clarity, bulging eyes, and inability to move the eye in all directions) should see a doctor right away.