Myodesopsias or flying masks

Myodesopsias or floating bodies are mobile spots of different size and density that appear on the campor visual and that are appreciated with greater intensity on a clear and bright background. 

Although these particles appear to be in front of the eye, in reality float inside. What the patient perceives is the shadows or floating flies that cast on the retina, (nerve layer located in the back of the eye and that is sensitive to light).

Miodesopsias or flies

Myodesopsias or floating bodies are mobile spots of different size and density that appear on the campor visual and that are appreciated with greater intensity on a clear and bright background. 

Although these particles appear to be in front of the eye, in reality float inside. What the patient perceives is the shadows or floating flies that cast on the retina, (nerve layer located in the back of the eye and that is sensitive to light).

What are myosopsies or flying flies?

Myodesopsias, also known as flying flies, are a common eye defect that is especially associated with aging. Consists of the appearance of spots or floating bodies in different ways in our campor visual, as points or threads, especially when we focus on a clear and illuminated background.

Floating bodies can have different shapes: small dots, circles, lines, clouds, or remember small animals, like a fly, that's why they are also known as “myodesopsias or flies".

These spots are usually of gray color o black, which is why they are more clearly distinguished against a bright or light background.

Why do they occur?

They are usually produced by the aging of the vitreous humor, a gelatinous substance that fills the posterior cavity of the eyeball, its appearance being more common in myopic people and increasing its incidence with age.

In some cases, the appearance of myodesopsias may be a manifestation of other ocular processes such as posterior vitreous detachment, intraocular hemorrhages, uveitis (intraocular inflammations) or retinal detachmentTherefore, at the moment of appearance, an urgent ophthalmological examination is advisable.


To understand the causes of myodesopsies, it is important to understand the area of ​​the eye it affects.

The vitreous is a gelatinous structure that is inside the eye, in contact with the retina, and is composed of water and hyaluronic acid. The most common cause of myodesopsia is that over the years this gelatin can be liquidated and separated from the retina, which produces a condition known as posterior vitreous detachment. This picture leads to the formation of small collagen fibers that end up clustering and producing a shadow on the retina, which gives rise to myodesopsias or flying flies.

Below we list the most common and less common causes of myodesopsia, as well as the subsequent vitreous detachment:

Causes more conunes

The main causes of myodesopsias are:

Age: The aging natural of our body may cause changes in the vitreous structure, leading to its detachment. Therefore the cfloating bodies are a common condition in the elderly.

High myopia: the second most frequent cause de flying flies is myopia in high dioptersKnown as myopia magna. Due to the very shape of the eyeball of the myopic, they are more prone to vitreous detachment. Flying flies can occur in myopic people of all ages.

Less common causes

Although much less common, there are other conditions that can also cause the presence of floating bodies are:


Vitreous detachment

Posterior vitreous detachment is more common among people who:

  • They are myopic.
  • They have been cataract operated.
  • They have undergone laser YAG surgery on the eye.
  • They suffer from inflammations inside the eye.


In most cases, flying flies are a harmless condition that does not affect our ability to see correctly and is not associated with any malignant condition, however, it is important go to an ophthalmologist for a timely diagnosis. Its sudden appearance may indicate the presence of an eye problem that requires immediate attention, so it is essential not to miss the visit to the specialist.

If myodesopsias are accompanied by other symptoms such as loss of lateral vision, flashes of light, the increase in spot size or if they stop moving, It is advisable urgently go to an ophthalmologist to rule out any relevant complications.


The symptoms of flying flies They are clear and easily noticeable to anyone suffering from this condition.

Occasionally, the person may see small dots or clouds that move in you campor visual, that is why they are called floating bodies. They are usually observed when looking at a simple, clear background, such as a wall or blue sky, when there is more light, or when looking at a white paper.

Some of its symptoms are: 

  • Appearance of spots that move in the Campor visual slowly. They can have the shape of threads, dots or, most commonly, cobwebs.
  • Floating bodies they are better distinguished when we look at a light and bright background, like a white wall or the sky on a clear day.
  • By moving our eyes, the spots also move even more slowly, as if they floated in the campor visual
  • His presence sharpens when we suffer episodes of stress, anxiety or when we feel very tired.

When they appear suddenly, the patient will also experience flashes of light in the eyes. In this case, an immediate consultation with the ophthalmologist is recommended.


Only an eye health professional can diagnose this condition. An ophthalmologist will perform a thorough examination to locate vitreous detachment In the back of the eye. I know will study the periphery of the retina to find tears or lesions that in the future may predispose to a retinal detachment.

Treatment of myodesopsies

Myodesopsia, although annoying, is a condition that normally does not compromise visual health and usually disappears after a while without affecting our eyesight. If they do not occur due to an underlying condition but are the product of aging or myopia, the ophthalmologist does not usually apply any treatment and the affected person becomes accustomed to their presence without major repercussions.

However, in those cases in which the floating flies are very dense y affect vision or when they are highly annoying for the patient, compromising your well-being emotional, you can choose two operations: the laser vitreolysis and the vitrectomy.


Yes, definitive results, the surgical alternative is the vitrectomy. Through this procedure you removes part of the vitreous, replacing it for a saline solution and thus definitively eliminating the flying flies. It is an ambulatory and effective operation that, however, applies in very specific cases.

Like any surgery, this option is not free of risks, so it only takes place in cases in which myodesopsias really affect the patient's day to day.

Vitreolysis with laser

Using a YAG laser, this technique dissolve the flying flies making them less noticeable to the patient and thus helping to reduce the discomfort that this condition may cause. It is important to be clear that this alternative does not completely correct the problem, just makes the spots are perceived with less intensity.

The application of this technique should be done by a specialized ophthalmologist, because the use of lasers in an inappropriate way could have repercussions on the retina.


Is it serious to have myodesopsias?

When the vitreous gelatin shrinks and separates from the wall of the eye, the retina may tear. This can cause a small hemorrhage in the eye, which may appear as a new group of floating bodies.

A tear in the retina is a serious problem, since it can end in a retinal detachment.

We recommend that you consult with your ophthalmologist if:

  • Suddenly a new floating body appears, even if it is a single one.
  • Suddenly he sees flashes of light.

When the vitreous rubs the retina or pulls it, it causes the sensation of flashes of light.

What do I do if I have myodesopsia?

As it is important to know if your retina has suffered a tear, see your ophthalmologist if a new floating body suddenly appears.

Sometimes, floating bodies interfere with vision, which can be very annoying, particularly during reading. Try moving your eyes, looking up and down, so that they move away from your line of sight. Although some floating bodies will remain in their campor vision, with the passage of time many will become less annoying.

I see flashes of light, are they myodesopsias?

When the vitreous rubs the retina or pulls it, you might see something similar to twinkling or light streaks. You may have already experienced this feeling if you were ever hit in the eye and "saw the stars".

Scintillations may appear and disappear for several weeks or months, and as we get older they are more common. If you suddenly see flashes of light, you should immediately consult with your ophthalmologist to see if the retina has suffered a tear.

Do myodesopsias give you a headache?

Some people experience flashes of light in both eyes with the appearance of jagged lines or "heat waves" that can last 10 to 20 minutes. This is usually due to a spasm in the blood vessels of the brain and retina, known as a migraine.

If the scintillations are followed by headache, they are called cephalic migraines. However, these dentate lines or "heat waves" can present themselves without headaches. In such a case, the scintillations are called ophthalmic migraines or migraines without a headache.

How is myosopsia review performed?

When an ophthalmologist examines your eyes, the pupils are dilated by drops in the eyes. During this painless examination, your ophthalmologist will look at your retina and vitreous humor. Because your eyes have been dilated, you will see blurrier after the exam for a few hours.

Floating bodies and flashes of light become more frequent as we get older. Although not all are serious, you should always undergo a medical eye exam by an ophthalmologist to make sure you have not suffered any damage to the retina.

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Miodesopsias o moscas volantes
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Miodesopsias or flies
Myodesopsias or floaters are a common eye defect that usually occurs as a result of aging. Discover its causes and treatment
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