Kolkata: COVID19 pandemic is the biggest public healthcare emergency facing the world today. The virus can have a devastating effect on the body, impacting many organs. However, not many people are aware that it can affect the eyes too, says Dr. Madhur A Hingorani, Consultant – Ophthalmologist, Dr. Agarwal’s Eye Hospital, Kolkata.
More than a year of the Covid pandemic has gone by, and ophthalmologists are gaining more knowledge about the disease with every passing day. It is now understood that Covid affects the retina (the posterior part of the eye) as well as its nerve. The disease can lead to formation of blood clots in the patient’s body which can block blood vessels in the retina. The patient may not notice anything wrong if the blocked blood vessel is minor or carries deoxygenated blood. However, in some cases, the main blood vessel carrying oxygenated blood to the eyes gets impacted by the virus, leading to deterioration or total loss of the patient’s vision. This can be rectified by timely diagnosis and proper management of the condition.
Dr. Madhur A Hingorani said that if the patient reaches an ophthalmologist within 6 hours of vision loss, his or her sight can be saved with prompt care to restore blood circulation in the eyes. In these cases, almost 100% or 95% vision of the patient can be restored. Any delay or complacency in reaching an ophthalmologist quickly can lead to permanent and irreversible damage to the eye.
Blocked blood vessels are not the only eye morbidity associated with Covid. Some patients may develop localized inflammation called retinitis. This is again treatable with medicines or injections.
Steroids are commonly used for the treatment of Covid, but this can be a doubled-edged sword. If used judiciously, steroids are lifesavers; if not, they can cause damage to the body. A category of patients called “steroid responders” tend to develop an increase in fluid pressure in their eyes when administered steroids. This condition can damage the eyes. In some cases that involve long-term use of steroids, patients can develop cataract. Timely checkup can avoid such complications, reversing the side effects of steroids and saving the patient’s vision.
Another issue with steroids is that they decrease the immunity of patients. In such cases, and especially for diabetics, fungal infection is common. This can lead to growth of black fungus in sinuses, which are small air pockets located behind the forehead, nose and cheek bones and between the eyes that produce mucus. In some cases, the black fungus can spread from sinuses to around the eye or, in some cases, even inside the eyes. This is a serious condition that needs immediate treatment.
In these pandemic times, it is important for Covid patients who develop any eye-related problem to visit an ophthalmologist without delay, said Dr. Hingorani.