Eye Health: Can Low Brain Pressure Play A Role In The Development Of Glaucoma?

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Said to be a leading cause of blindness for people over 60 years of age, glaucoma is often referred to as the ‘silent thief of sight’, because it progresses slowly and without noticeable symptoms until irreversible vision loss occurs.

Glaucoma is a disease of the eye that damages its optic nerve. According to the American Academy of Ophthalmology, it usually happens when fluid builds up in the front part of the eye, increasing the pressure in the eye and damaging its optic nerve. It is said to be a leading cause of blindness for people over 60 years of age, but blindness can be prevented with early diagnosis and treatment. Glaucoma is often referred to as the ‘silent thief of sight’, because it progresses slowly and without noticeable symptoms until irreversible vision loss occurs. And, while many risk factors are well-known, recent research suggests a new potential link — low brain pressure, says Dr Nusrat Bukhari, ophthalmologist, Apollo Spectra Mumbai.

According to the doctor, the optic nerve transmits visual information from the eye to the brain. When it is damaged, it gives rise to glaucoma, which is a group of eye diseases. “This damage is often caused by increased pressure within the eye, known as intraocular pressure (IOP). As the pressure builds up, it can compress and damage the optic nerve, leading to vision loss,” says Dr Bukhari. She adds that recent studies have indicated low brain pressure could also play a role in the development of glaucoma.

What Role Does Low Brain Pressure Play?

The doctor explains that normally, there is a ‘delicate balance’ between the pressure inside the eye and the pressure within the skull that holds the brain. When this balance is ‘disrupted’, it can have adverse effects on the optic nerve, ultimately contributing to glaucoma.

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Intracranial Hypotension

Low brain pressure, says Dr Bukhari, is also known as intracranial hypotension. It occurs when the pressure inside the skull is lower than normal. This can happen due to various factors:

Head trauma
Spinal fluid leaks
Certain medical conditions

“When the pressure in the skull drops, it can lead to changes in the pressure gradient between the eye and the brain, potentially affecting the optic nerve’s health,” she states.

What Research Says

Citing a study published in the journal ‘Ophthalmology‘, the doctor says individuals with a low brain pressure may be at an increased risk of developing glaucoma. “[This study found] patients with intracranial hypotension were more likely to have glaucoma compared to those without the condition. These findings highlight the importance of considering not only high eye pressure, but also low brain pressure as a potential risk factor for glaucoma.”

Symptoms Of Glaucoma

According to the doctor, the symptoms may include: blurred vision, eye pain or redness, halos around lights, tunnel vision, and even sudden loss of vision in severe cases.

Common Risk Factors

Some common risk factors for developing glaucoma include: age (over 60), family history of glaucoma, high intraocular pressure, thin corneas, and certain medical conditions such as diabetes and hypertension.

Prevention and Treatment

Dr Bukhari says traditional treatments and cutting-edge therapies can lead to improved outcomes and a better quality of life for those affected by glaucoma. Regular eye exams are crucial for early detection and treatment to prevent permanent vision impairment.

Decreased Cerebrospinal Fluid (CSF)

The expert warns that those with lower CSF pressure may be at higher risk for developing ‘normal-tension glaucoma’, which is a type of glaucoma where damage to the optic nerve occurs despite normal levels of intraocular pressure.

“By understanding how variations in brain pressure can impact eye health, it is possible to identify those at risk for glaucoma and intervene earlier to prevent irreversible vision loss. The main goal of treatment is to reduce intraocular pressure to slow down or prevent further damage to the optic nerve. Medications like eye drops, oral medications, and in some cases surgery may be used to manage glaucoma effectively,” she concludes.

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