What is OHS?
Ocular Histoplasmosis Syndrome (OHS), also known as presumed ocular histoplasmosis syndrome, is one of the causes of visual impairment in the eastern and central parts of the United States. This syndrome is correlated with exposure to the fungus Histoplasma capsulatum. This fungus is found in areas where there is an accumulation of bird and/or bat droppings. Exposure to the fungus can cause mild flu or cold-like symptoms. The body typically naturally fights off the histoplasmosis infection within a few days of exposure, even without treatment. People who have been exposed to this fungus occasionally develop ocular histoplasmosis. This syndrome is not an active infection as the fungus is not found in the eye but is considered an immune reaction to the fungus. Generally, this syndrome does not affect vision; however, rarely this condition may affect central vision and need treatment.
Symptoms of OHS?
OHS can start to impair your vision. Some of the ocular histoplasmosis symptoms include:
- Blank spots in your vision/ blind spots
- Distorted vision
- Change in color perception
- Central light flashes or flickering
Who is at Risk for OHS?
Living in Ohio and the states in the Mississippi River Valley are at a higher risk and having a weakened immune system are both risk factors for OHS. These people are more likely to be exposed to the fungus that causes histoplasmosis. Few people go on to develop OHS or even know that they have histoplasmosis. It is important to watch for changes in vision that could be signals of this condition.
How to Treat OHS?
Your ophthalmologist or eye doctor will perform a dilated eye exam to look for any signs of histoplasmosis. In particular, they will be looking for histo spots and swelling of the retina. If OHS has been found, then they will start treatment. Depending on your concerns, stage of OHS (early stages versus late stages), and lifestyle, there are a few different treatment options available.
- Anti-VEGF Treatment: The chemical known as vascular endothelial growth factor causes abnormal blood vessels to grow under the retina. One method of treating OHS is to target VEGF. This helps to slow vision loss. The ophthalmologist injects the anti-VGEF into the eye.
- Laser Treatment: The laser beam targets the abnormal blood vessels in the retina that are causing vision loss.
At a consultation with your eye care specialist at Boston Vision, we will discuss your treatment options and which one will work best for you.
Schedule a Consultation
If you notice any signs or symptoms of Ocular Histoplasmosis Syndrome, then schedule a consultation with a Boston Vision specialist. To schedule your appointment, book online with us to get started.
