What Is Miosis?
Miosis is a condition where the eyes are open or closed. There are many different causes of miosis, but most commonly it occurs due to trauma to the eye. Other causes include:
Age – The eyelids close when one gets older and then slowly open up again with age. This leads to a loss of vision. However, there is no reason why this should happen if one does not have any other cause for this problem.
Eye Problems – Eye problems such as cataracts, glaucoma, macular degeneration (AMD), retinal detachment and other conditions may lead to the eyelid closing down completely. These conditions will result in complete blindness.
Drugs – Certain drugs such as alcohol, tobacco and certain medications can cause the eyelids to close entirely. If this happens, one would lose all sense of sight.
Other Causes – Some cases of miosis occur because of brain tumors, strokes, infections, tumors and other diseases.
Symptoms Of Miosis
The following list includes some common signs and symptoms of miosis. You may notice that these symptoms do not always match the actual cause for the condition. For example, if one is suffering from Alzheimer’s disease, they might experience confusion instead of blindness. This is because miosis can affect various areas of the brain, which may or may not cause certain symptoms to develop on a case-by-case basis.
Alcoholism – Those who suffer from alcoholism may notice that their vision gets worse as they continue to drink over time. The miosis would then lead to total blindness depending on how much alcohol has been consumed.
Bilateral Miosis – Many sufferers experience bilateral miosis, which means that both of the eyes are closed down entirely. This is a common symptom of brain tumors and other diseases that block out all light from entering the eyes.
Cataracts – Cataracts cause the lens of the eye to become partially or completely opaque. Since light is unable to enter the eyes, the victim will be left in darkness even if his or her eye is open.
Convulsions – Some people who suffer from miosis may also have convulsions. This will make the muscles of the body contract rapidly and this can sometimes lead to death.
Diagnosis For Miosis
The medical community has a number of tests that it can perform in order to determine what is causing your miosis. These tests may include:
Blood Tests – A blood test can be performed in order to rule out various diseases that may be causing miosis. The doctor may also check certain elements within the blood such as the potassium levels, kidney health and other factors.
CT Scan – A CT scan allows the radiologist to take a look at the various parts of the brain in order to see if there is anything irregular going on such as a tumor or cyst.
MRI – An MRI or magnetic resonance imaging scan will allow the radiologist to take a look at the various parts of the brain in order to see if there is anything abnormal going on such as a tumor or cyst.
Treatment Options For Miosis
There is no one treatment that works for everyone who suffers from miosis. The medical community will need to take a look at each individual case and perform a variety of tests to determine the cause of the miosis as well as what the best course of treatment will be. In many cases, surgery and pharmacological intervention are used in order to heal the affected individual. This may also include brain surgery or even chemotherapy in severe cases.
Prognosis For Miosis
While there are many different types of miosis, most sufferers recover in one way or another. Some recover quickly with only minor after-effects while others experience permanent damage that cannot be undone. In some cases, the victim may die from the condition. In any case, the patient will have a much better prognosis if he or she receives immediate medical help.
Sources & references used in this article:
Aging, senile miosis and spatial contrast sensitivity at low luminance by ME Sloane, C Owsley, SL Alvarez – Vision research, 1988 – Elsevier
Mechanism of morphine-induced miosis in the dog. by HK Lee, SC Wang – Journal of Pharmacology and Experimental …, 1975 – ASPET
Inhibitors of surgically induced miosis by RM Duffin, CB Camras, SK Gardner, TH Pettit – Ophthalmology, 1982 – Elsevier
Ophthalmoplegia, ptosis, and miosis in temporal arteritis by J Dimant, D Grob, NG Brunner – Neurology, 1980 – AAN Enterprises