Optic Atrophy: Symptoms, Causes, Diagnosis, and Treatment Options.
Last updated: August 6, 2021
Optic Atrophy is a condition that affects the optic nerve, and that can cause extensive damage to the visual pathway. Affected individuals will present with a pale optic disc due to this damage. There are several known causes of Optic Nerve Atrophy, and it is important to identify the condition early for a good prognosis. There is no known cure, nor effective treatment for Optic Atrophy, and healthcare is directed at the management of symptoms. Although there is no cure, enhanced vision glasses such as eSight may help individuals living with the condition to experience significant improvement in sight.
For this article, we have researched and gathered all the information necessary to a well-rounded understanding of Optic Atrophy and how to better live with the condition.
What is Optic Atrophy?
Optic Atrophy (OA) refers to a neuro-ophthalmic condition and is not considered a disease. Atrophy, here, refers to the wasting away or progressive decline of the nerve fiber of the optic nerve.. What is affected is the primary retinal ganglion cells (RGC) and the axons forming the optic nerve. The RGC and axons process visual information which begins as light entering the eye, which then gets transmitted to the brain.
“Optic Atrophy” means that some or all of the nerve fibers of the optic nerve have been lost or simply experienced “optic nerve shrinkage”. This could lead to progressive bilateral degeneration of the optic nerves and subsequent vision loss.
How does it work? Light carries visual information about the world around us. The process of seeing beings with light travels through the clear outer coating of your eye, (known as the cornea), and travels through your pupil to enter your eye. Once inside your eye, the light strikes a light-sensitive layer of tissue that lines the back of your eye. This tissue, known as the retina, absorbs the light and converts the visual information into electrical pulses. These electrical signals travel through a bundle of nerve fibers, known collectively as the optic nerve, to the brain. Your brain then translates the electrical pulses into the images we “see.” With Optic Atrophy, there is an interference with the ability to transmit these pulses.
In people with Optic Atrophy, the optic nerve has lost some or all of its nerve fibers. Any damage to the nerve fibers can cause blurry vision because damage to the optic nerve can prevent the brain from getting the information it needs to create a clear image.
Optic Atrophy vs Optic Neuropathy
It has commonly been suggested that a suitable term for Optic Atrophy is Optic Neuropathy, but this has been highly debated. Optic Neuropathy is associated with optic nerve damage from any cause. However, Optic Atrophy is an end-stage condition due to innumerable causes of damage to the optic nerve that occurs anywhere in the optic pathway. As a result, in the case of primary Optic Atrophy or traumatic brain injury, Optic Neuropathy may not occur.
Prevalence of Optic Atrophy. How common is it?
There is a wide and varied prevalence of Optic Atrophy. The prevalence of blindness caused by Optic Atrophy is 0.8%, according to a New England Journal of Medicine study cited in a Medscape report, which noted that another report in Archives of Ophthalmology found the prevalence of visual impairment was 0.04%, and blindness was 0.12%. It’s a rare condition by any standard.
Although the condition can occur in any ethnicity, it appears to be more common in those of Danesh descent according to a report in USA Rare Diseases. The prevalence of Optic Atrophy also differs by race, with occurrence being 0.3% in African Americans, compared to 0.5% in Caucasians. Optic Atrophy affects both genders equally and can occur at any age.
Optic Atrophy vs Healthy Optic Nerve
The optic nerve is the circular-shaped pinkish area in the middle of the retina. The blood vessels of the retina radiate from the center of the optic nerve. In a healthy eye, the optic nerve is pink in color, whereas with Optic Atrophy, there is a pallor of the optic nerve.
Read more on the anatomical differences between a healthy optic nerve and an atrophied optic nerve.
SIGNS AND SYMPTOMS
Symptoms, Signs, and Risks of Optic Atrophy
The most common signs and symptoms are dimming of vision and a reduction in the patient’s field of view. Patients typically lose their ability to see in fine detail as well, noted Medline. This might be the first time a person notices something is happening to their vision.
- Dimmed vision
- Reduction in field of view
- Loss of ability to see in fine detail/ color
- Decreased brightness perception
Subtle and progressive damage may present itself with the patient losing their ability to detect contrast or color within their vision. If atrophy occurs in one eye, the patient may have a decreased brightness perception in one eye over the other. Pupils will also become less reactive to light over time and eventually, the individual may experience complete vision loss in the affected eye.
There may be other symptoms present such as eye pain, ataxia, and weakness, but these symptoms would be attributed to the underlying condition that caused the damage, rather than OA itself.
Risk factors of Optic Atrophy range from a family history of neuropathies to increased intraocular pressure (glaucoma), infection, compression (tumors), ischemia, inflammation, medication history, known malignancy, history of diabetes, hypercholesterolemia, and hypertension.
Can Optic Atrophy cause blindness?
Yes, Optic Atrophy can cause blindness. Its effect can be from anywhere mild vision changes to complete loss of vision.
Causes of Optic Atrophy
As Optic Atrophy is a condition that has a number of causes, diagnosis may begin at the primary care provider or in the office of your eye doctor. Generally, an underlying condition is getting in the way of the optic nerve conducting signals to the brain. According to the Cleveland Clinic, the most common causes include:
- Optic nerve formed improperly before birth
- Vision loss occurs in one eye first, and then the other, an indication that the patient has an inherited condition called Leber’s hereditary optic neuropathy
- Multiple sclerosis causes optic neuritis, which is a swelling or inflammation of the optic nerve caused by MS
- A growing tumor is pressing on the patient’s optic nerve
Tumors are the most common cause of OA in both eyes, traumatic periocular and head injuries are mostly associated with unilateral Optic Atrophy in men. In individuals over the age of 40, vascular issues such as hypertension commonly cause OA.
Such various potential causes of Optic Atrophy underscore the importance of visiting a primary care provider on a regular basis as well as seeing an eye doctor at least once a year for routine surveillance of eye health. After all, symptoms that present themselves in the eyes can sometimes be the first signs of another undiagnosed health condition, detected by the eye doctor before they are discovered by a family doctor.
Glaucomatous Optic Atrophy
Glaucoma is a common cause of Optic Atrophy. More information on Glaucomatous Optic Atrophy can be found here “Glaucoma”
Hereditary Optic Atrophy
Hereditary Optic Atrophy includes Leber Hereditary Optic and Dominant Optic Atrophy, which are mitochondrial cytopathies, meaning there is a mutation in the mitochondrial DNA. Dominant Optic Atrophy is an autosomal dominant condition and the most common of the neuropathies. It has a prevalence of about 1:10,000 to 1:50,000 and is understood to be a progressive vision loss, because of the premature (usually in the first decade of life) degeneration of the optic nerve.
Leber Hereditary Optic Atrophy occurs due to mitochondrial DNA abnormality which impedes cellular respiration. The primary and typically earliest sign of Hereditary Optic Atrophy is vision loss. It commonly occurs in males (about 80 – 90% of those affected are male), but only females can pass on the abnormality to the next generation.
Diagnosis of Optic Atrophy
Diagnosis of Optic Atrophy can be made by using an ophthalmoscope to observe the optic disc. This is done by an ophthalmologist. Pallor of the disc is indicative of limited blood flow, suggesting OA and leading to nerve damage. Further ophthalmologic tests can be done including checking peripheral vision and the ability to distinguish colors from one another.
Additional tests may include:
- Visual field tests to confirm the diagnoses and observe changes overtime
- Magnetic Resonance Imaging (MRI) of the brain can be used to view potential causes of Optic Atrophy, such as lesions, inflammations, fractures, etc.,
- Computed Tomography (CT) scans are used to check for fractures
- Orbital tumors can be seen by using ultrasonography (B-scan)
- Diabetes diagnosis can be made by checking the blood glucose level
- For vascular etiology, blood pressure and other cardiovascular indicators can be tested
- Electroretinography (ERG) results may show abnormalities in the retina
- Nutritional deficiency in vitamin B12 can be evaluated
It is important to diagnose Optic Atrophy early to reduce its progression. This is because Optic Atrophy damage cannot be reversed.
Optic nerve pallor. What does a pale optic nerve indicate?
The pallor, that is, uncharacteristic paleness of the optic nerve, indicates the absence of the small blood vessels in the optic disc head as a result of Optic Atrophy from another primary cause. Lack of blood flow and compression of the optic nerve can be a primary cause. The normal, healthy color of the optic disc is pink, due to the rich vascularization.
Treatment options for Optic Atrophy
Optic Atrophy is currently irreversible. However, it’s prudent to consult with a doctor to learn about any underlying disease that could cause the condition to progress further. This includes regularly monitoring blood pressure and taking steps to keep it under control, with supervision from primary health care providers. Be sure to schedule eye exams once per year, to be screened for possible glaucoma.
Local support groups can also help when living with Optic Atrophy. The USA Genetic and Rare Diseases Information Center’s page on Optic Atrophy provides local resources for patient support.
Glasses for Optic Atrophy | Award Winning Assistive Tech
Many successful eSight users live with optic atrophy. eSight is a non-surgical wearable solution that provides the brain with increased visual information to naturally compensate for gaps in the user’s field of view.
For those living with optic atrophy, such as football coach Cosmo Moore, eSight remains a popular choice since it is one of the only tech devices that boasts substantial mobility for its users while ensuring all-day comfort. With eSight, Cosmo was able to go from having a visual acuity of 20/400 to experiencing 20/40 vision for the first time in his life. Beyond the practical benefits, eSight has given Cosmo confidence and helped him lead an even more independent life. He now works as an eSight coach helping others to use, what he calls, a “spectacular piece of technology.”
You can read more user reviews here: Reviews.
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What is Optic Atrophy?
Optic Atrophy is a condition of the nervous system that affects the vision by the shrinking of the optic nerve. Early detection of Optic Atrophy is essential for limiting the progressive nature of this condition. Damage from Optic Atrophy is not reversible, so patients with symptoms should address it as soon as possible with their ophthalmologist.
What is the ICD-10 code for Optic Atrophy?
The 2021 ICD-10-CM Diagnosis Code for optic atrophy is H47. 2.
Is Optic Atrophy genetic?
Yes, it can be. Hereditary Optic Atrophy includes Leber Hereditary Optic Atrophy and Dominant Optic Atrophy. They are considered to be mitochondrial cytopathies.
Can you see with Optic Atrophy?
Yes, however, the extent of vision functionality varies from person to person. Some individuals do experience complete loss of vision.
Does Optic Atrophy get worse over time?
Yes, it is a progressive loss of vision but damage can be limited with proper medical intervention.
How rare is Optic Atrophy?
It is considered a rare condition, affecting approximately 1 in 35,000 people. The prevalence of blindness due to Optic Atrophy is 0.8%.
Can Optic Atrophy cause blindness?
Yes, Optic Atrophy can result in blindness.
What are the symptoms of Optic Atrophy?
The main symptoms of optic atrophy include:
- Abnormal peripheral side vision
- Decreased brightness in one eye compared with the other eye
- Blurred vision
- Abnormal color vision
Can Optic Atrophy be cured?
No, there is currently no available cure, but research is in motion such as neuroregeneration, cited the University of Cambridge.
What causes Optic Atrophy?
In most cases, Optic Atrophy has no known cause. Several diseases and disorders can damage the optic nerve bundles to cause Optic Atrophy. In some cases, the optic nerve does not develop properly in utero. In other cases, inflammation of the optic nerve or the high pressure inside the eye from glaucoma may cause Optic Atrophy later in life. Rarely, poisons, vitamin deficiencies, or tumors can damage the optic nerve fibers resulting in Optic Atrophy.
How do eye doctors diagnose Optic Atrophy?
Eye doctors diagnose Optic Atrophy through a comprehensive eye exam that assesses your visual acuity (which is the sharpness of your vision), color vision, peripheral side vision, and how well your pupils react to light.
What treatments exist for Optic Atrophy?
Unfortunately, medical science has not yet developed an effective treatment for Optic Atrophy, because once nerve fibers are lost, they cannot heal and do not grow back. However early diagnosis and treatment of the underlying cause of optic atrophy can help prevent damage from getting worse.
Can glasses help Optic Atrophy?
Assistive devices can help individuals with Optic Atrophy to improve their vision. For example, eSight technology stimulates synaptic activity from remaining photoreceptor function, thereby providing more information to the brain to process, and thus improving the visual field for affected individuals.
Community Resources and Support Groups
The USA Genetic and Rare Diseases Information Center’s page on Optic Atrophy provides local resources for patient support. Local support groups can also help when living with Optic Atrophy.