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4 Causes of Dilated Pupils

4 Causes of Dilated Pupils

4 Causes of Dilated Pupils

Dilated Pupils are larger than the normal size of the pupil and it is controlled by muscles in your eyes that are known as iris. It also controls the light that reaches your eyes. In bright light, your pupils get smaller as they prevent light from entering your eyes. In dim lighting, your pupils get larger and allow light to enter.

Normally the size of the pupil is from 2 to 4 millimeters in bright light. In the dark, it is recorded usually 4 to 8 millimeters. The size of the pupil tends to get smaller as their age progresses. 


According to the study, in people ages 16 to 34 years old, the average pupil size is found in three different conditions. The first condition is 3.35 mm indirect light, the second is 3.86 mm in normal light and the third one is 6.41 mm in complete darkness.

If you wear prescription eyeglasses then you should never take it off, as it will keep your eye pupils and vision stable. 

Dilated pupils can also react to light as it can get smaller when light is shined at it. Normally, dilated pupils do not react to the light. A large pupil is known as a “fixed” dilated pupil that does not react to the light.             

Here are some of the major causes of dilated pupils to make you understand what factors are involved in pupil dilation.

Medicines

There are certain medications that you should avoid as they can cause pupils to dilate and affects the reactivity of pupils. These medications include anti-nausea and anti-seizure drugs, tricyclic antidepressants, Parkinson's medicines, and such medications are the major cause of dilated pupils.

Injured Eye

A serious eye injury can be one of the major causes of dilated pupils. Such injury could damage your iris and transform your pupil into an unusual shape. This type of injury may need surgery to get fixed.

Brain Injury

Any head injury, disease, or stroke affects your eye vision and causes dilated pupils. In sports competition, you may have seen the doctors inspecting the athlete’s pupils with a penlight if he or she experiences head trauma.

Drug Abuse

According to the statistical study, overuse of alcohol, marijuana, cocaine, and other drugs harms your eyes’ capability in recovering from bright light. It also affects the ability of your eyes to respond to light. 

The above-mentioned causes of dilated pupils are going to give you an understanding of what you need to do to ensure that your eyes’ pupils keep working perfectly. 

If you wear eyeglasses then it’s necessary that you should wear it whenever you go out in sunlight. Having weak eyesight means that your eye vision is not strong enough to bear the sunlight. That is why wearing glasses is mandatory.

Author

Suleman Khan

He is a representative of Webnet Pakistan.

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