Mydriasis is the medical term for the dilation of the pupils in the eyes. This condition can occur in response to low light conditions, allowing more light to enter the eye, or as a reaction to certain medications, drugs, or medical conditions. It can be a temporary response or a sign of underlying health issues. In some cases, mydriasis can be caused by the use of substances like cocaine or amphetamines, which stimulate the nervous system. It may also occur due to injuries or diseases affecting the eye or brain. If persistent, it is important to consult a healthcare professional for evaluation.