This condition means only one pupil is dilated. Doctors sometimes call it "benign" when it's not related to any serious conditions, but it can sometimes affect young women who get migraines. The pupil usually goes back to normal size within a few hours, but it can last several days. You...
What happens when one pupil is dilated? Physiological anisocoria is when there is a natural, small difference in the size of a person's pupils. This is not harmful and does not require treatment. However, a sudden and pronounced change in one pupil size can indicatea medical condition. What...
Consider one of these mechanisms carried out by the pupil. The primary function of the pupil is to regulate the amount of light that falls on the eye’s lens. The expansion or contraction is an involuntary reflex, known as the pupillary reflex. You might have noticed how the black dot sh...
When one pupil is larger than the other this is known asanisocoria. What causes dilated pupils? There is a broad range of factors which cause dilated pupils. Here are some of the most common causes: Medications Both prescription and non-prescription medications can affect how our pupils respond...
Should I be worried if one pupil is bigger than the other? If a person's pupils are suddenly different sizes, it isbest to seek medical attention. While not always harmful, a sudden change can indicate serious and dangerous medical conditions. It is especially important to seek medical attent...
For size reference, a dilated pupil in dim lighting is 4-8 millimeters, while a normal, undilated pupil is 2-4 millimeters in bright lighting. The size of your pupils is controlled by tiny muscles from the colored part of your eye, called the iris. Your pupils naturally constrict and dil...
Blind spots are an area in which one is not able to see or perceive. One can find a blind spot by closing one eye and looking at a photo with a plus sign on a green background on the left side and a dot on a yellow background on the right. When you move in towards this the...
Cardiac muscle is the muscle tissue found in the heart, responsible for contracting to propel blood throughout the body. Cardiac muscle is also known as myocardial tissue and functions similarly to skeletal muscle. It is composed of cells called cardiomyocytes, which are responsib...
Your eye is made up of three stratums, the outer, inner, and middle layers. The middle layer is where most melanomas form. They typically occur in the uveal tract, which houses the iris, pupil, muscle fibers, and layer of blood vessels that provides nutrients to reach the retina. This...
It is thought that the condition is caused by a mutation of the genes determining melanin distribution, which often becomes changed due to chromosomal homogeneity. The photograph above of actor Josh Henderson is an example of someone with heterochromia. Notice one of his eyes are green. The othe...