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...
A blown, or blown out, pupil is characterized by apupil that is largely dilated and unresponsive to light. When it occurs, a fixed dilated pupil may be present in one or both eyes. Typically, blown pupils are seen in response to brain damage caused by trauma or stroke, though less serio...
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...
Can the Eyes Help Us Detect Liars? ... And speaking of the eyes, studies have shown thatliars' eyes often dilate while telling a lie. In fact, pupil dilation and fear of betraying themselves with their eyes is considered one of the prime reasons why serious poker players wear sunglasses ...
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...
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...
The Earth's oceans used to be green — and could one day turn purple, scientists say Animals with unusual eye colors fall on the same color continuum, Fromer said. It's not uncommon for cats to have bright green eyes.(Image credit: Maciej Bledowski Shutterstock.com) ...
(and nearly everyone feels affection for babies), and dilated pupils are often associated with friendliness. Darker irises make the margin between the edge of the pupil less distinct so that in dogs the whole eye seems to be one big pupil. These investigators reasoned that if such ...