Pupil dilation love9/4/2023 ![]() This can also be caused by a stroke or tumour, affecting the muscles and nerves in your iris. Trauma to the head can cause pressure to build in your brain. The function of your iris muscles should then gradually return to normal, in turn improving your dilation function.Īside from drug or medication use, dilated pupils can also occur as a result of a brain injury, disease or eye injury. In some cases, withdrawing from taking these drugs after regular use can also dilate your pupils. This means that when you move from a dark environment to a light one, your pupils don’t adapt as quickly as they should, if it all, leaving you with dilated pupils. These types of medicines and drugs can cause the muscles in your iris to slow down and not react as well as they should to changes in light. Medicines which can have this effect are wide-ranging but typically include:Ĭonsumption of illegal recreational drugs can also cause your pupils to dilate. The dilation of pupils is also called mydriasis. This can be due to certain types of medicines or because of eye and brain injuries. This happens in order to protect your eyes from overexposure to bright lights as well as to aid your vision in low-light scenarios.Īs discussed, your pupils primarily dilate in dim lighting to allow you to see well, but your pupils can also dilate for reasons which do not relate to the level of light surrounding you. In lighter environments, the pupil contracts to prevent too much light from entering the eye, while in darker environments, the pupil expands to allow as much light as possible into the eye. The muscles in your iris (the coloured part of your eye) control the size of the pupil, which is what determines how much light enters your eye. Dilated pupils, otherwise known as big pupils or large pupils, is the name for when your pupils (the black part in the centre of your eye) grow larger than the average 2-4mm size in bright light.
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