Scheerer’s Phenomenon, also known as entoptic phenomenon, refers to the visual perception of structures or patterns within the eye itself.

These patterns are not externally visible, but rather originate from within the eye and are perceived by the individual. These structures often appear as small dots, lines, or spirals of light in the visual field.

What Causes Scheerer’s Phenomenon?

The structures perceived through Scheerer’s Phenomenon are actually the patterns of blood vessels in the retina of the eye. The light entering the eye is absorbed by the retina, which contains a vast network of blood vessels.

These blood vessels block some of the light and cause shadows on the retina, creating the patterns that are seen through Scheerer’s Phenomenon.

What do the White “Flies” Signify?

The white “flies” that are often seen in the visual field as a result of Scheerer’s Phenomenon are actually white blood cells that are flowing through the blood vessels in the retina of the eye.

These white blood cells, or leukocytes, can be seen as tiny, bright moving dots or strings of light that drift through the visual field.

Is Scheerer’s Phenomenon a Cause of Concern?

Scheerer’s Phenomenon is a normal and harmless visual occurrence and does not typically indicate any underlying health issues. It is a common experience that people of all ages and visual acuity can encounter.

The white “flies” that are often seen as a result of Scheerer’s Phenomenon do not interfere with vision and tend to be more visible in certain lighting conditions.

Can Scheerer’s Phenomenon be Managed or Treated?

Since Scheerer’s Phenomenon is a normal and harmless occurrence, there is generally no need for any management or treatment.

If the appearance of the white “flies” is accompanied by other visual symptoms, such as flashers, floaters or loss of vision, it may indicate a more serious condition that would need to be evaluated by an eye care professional.

Other Causes of White Flies or Spots in Vision

While Scheerer’s Phenomenon is the most common cause of white “flies” in your vision, there are other conditions that can also cause this phenomenon.

The following are some of the potential causes of white “flies” or spots in vision:.

1. Migraine Headaches

Migraine headaches are a common neurological disorder that can cause visual symptoms, such as bright spots or “flies,” in addition to other symptoms like headaches, nausea and sensitivity to light and sound.

Migraine-related visual disturbances are often referred to as “aura” and can last anywhere from 5 minutes to an hour or more.

2. Posterior Vitreous Detachment

Posterior vitreous detachment occurs when the gel-like substance that fills the center of the eye separates from the retina. This separation can cause floaters, flashes and a sensation of “flies” in the visual field.

Posterior vitreous detachment is more common in people over the age of 50 and may also be accompanied by decreased vision or distortion.

3. Eye Floaters

Eye floaters are small, moving spots or specks in the visual field that occur when the vitreous, a gel-like substance that fills the eye, slowly shrinks and becomes stringy.

This process can cause small clumps of debris to form and move in the field of vision, creating the appearance of “flies” or spots. Eye floaters are common and typically harmless, but if they suddenly increase in number or are accompanied by flashes of light, it could indicate a more serious condition.

4. Ocular Migraines

Ocular migraines are a type of migraine headache that affect vision and can cause temporary loss of vision, flashes of light and other visual symptoms.

While ocular migraines can be alarming, they are not usually a cause for concern and do not require any treatment. However, if you experience frequent ocular migraines, it’s a good idea to talk to your doctor.

Conclusion

Scheerer’s Phenomenon is a normal and harmless visual experience that occurs due to the presence of blood vessels in the retina of the eye.

The white “flies” that often appear as a result of this phenomenon are actually white blood cells that are passing through the blood vessels. While Scheerer’s Phenomenon is not a cause for concern, it’s important to be aware of other potential causes of white “flies” or spots in vision and seek medical attention if necessary.