A sudden change in vision is a worry which is true of when it comes to vision in only one eye. Central retinal vein occlusion (CRVO) is a retinal vascular issue in which the main vein which drains blood from the retina becomes blocked. This in turn causes retinal bleeding and swelling which at times affects central vision. Timely assessment is key because the proper central retinal vein occlusion treatment depends on what is going on in the eye.
CRVO does not affect each patient the same. Some have only mild visual changes, while others develop extensive retinal swelling or reduced blood flow. Being aware of the warning signs, diagnostic tests and what options are available for central retinal vein occlusion treatment help patients to get specialist care at the right time.
What Is Central Retinal Vein Occlusion?
The retina has a system of blood vessels which supply the tissue which gives us our sight. In CRVO the central retinal vein does not drain blood properly. This in turn causes pressure in the retinal circulation to go up which in turn causes blood or fluid to leak into the retinal tissue. If the macula which is affected by this swells up reading, recognizing faces and fine detail may become a struggle.
Doctors report that most cases of CRVO fall into two categories non-ischaemic and ischaemic. In the non-ischaemic category the disease is usually less severe while in ischaemic it is a greater reduction in retinal blood flow which is noted and also the risk of complications is higher. Also people with CRVO eye disease may have concomitant high blood pressure, diabetes or glaucoma in which case may see a referral to the appropriate medical specialist for management.
A central retinal vein blockage does not equate to a simple change in spectacle power. That is a vascular issue within the retina and requires an eye exam for diagnosis. The results of that exam help to determine if central retinal vein occlusion treatment is required and also play a role in how urgent that treatment should be.
Central Retinal Vein Occlusion Symptoms to Watch For
The primary Central Retinal Vein Occlusion symptoms are that of blurred or reduced vision in one eye. The change may suddenly occur or may progress over a short time. Also reported is hazy vision, trouble with reading, a decrease in the sharpness of central vision. In more advanced cases see redness of the eye and discomfort when complications do present.
The picture of Central Retinal Vein Occlusion symptoms is similar to that of other retinal diseases. That is why single out symptoms is not enough for a diagnosis of CRVO. Any person who reports unexplained visual changes should see the ophthalmologist as soon as possible, especially if they also have diabetes, hypertension, glaucoma or any other vascular risk factor.
Recognizing central retinal vein occlusion symptoms at an early stage does not mean will see injections for all patients. Rather it gives the specialist a chance to look at the retina, determine blood flow, and determine which central retinal vein occlusion treatment is best for that patient. Also the use of anti vegf for CRVO is suggested after a full evaluation of the retina.
| Warning sign | Why it matters |
| Sudden blurred vision | May indicate a retinal circulation problem. |
| Reduced vision in one eye | Needs assessment to identify the cause. |
| Distorted central vision | Can occur when the macula becomes swollen. |
| Redness or discomfort | May occur with serious complications. |
How Is CRVO Diagnosed?
Diagnosis begins with a comprehensive eye exam which usually includes pupil dilation. The ophthalmologist will look at the retina for bleeds, swelling, changes in blood vessels and other indicators which will help to distinguish CRVO from other causes of vision loss. Also in this exam the stage of the disease is determined. Optical Coherence Tomography is also used which produces cross sectional images of the retina. It is used to identify fluid and macular swelling and is also used for follow up. In some cases Fluorescein angiography is recommended to study retinal circulation, leakage and areas of inadequate blood flow.
These tests are a key element in the planning of central retinal vein occlusion treatment as the decision which treatment to use is based on the clinical picture which the patient presents with and not just the diagnosis. Vision, macular swelling, retinal blood flow and the risk of complications play a role in the treatment plan. Also this allows the specialist to tailor central retinal vein occlusion treatment to the patient’s individual retinal findings which may differ from one patient to the next.
Central Retinal Vein Occlusion Treatment Options
There isn’t one universal treatment for all cases of central retinal vein occlusion. What is done in the case of CRVO is based on what type of CRVO it is, how much retinal swelling there is, a patient’s vision, and what complications may be present. For some patients active treatment will be required, for others a close watchful study is required under the care of a retinal specialist. In terms of what they are trying to achieve with central retinal vein occlusion treatment is to deal with retinal changes and at the same time preserve as much usable vision as they can.
In patients which have macular edema, anti-VEGF agents are a very large part of our current approach to CRVO treatment. VEGF is a contributor to abnormal blood vessel leakage and retinal swelling. By reducing VEGF activity, these drugs are able to help in the control of fluid in the retina and also may improve or stabilize vision in the right set of patients.
Patients which are researching anti vegf for CRVO should know that an injection is not a one time procedure. Some patients do require a series of injections which is followed up with OCT and vision tests, while also some may have a different follow up plan. The timing of treatment is individual to each patient’s retinal response. Also because of that variable response, central retinal vein occlusion treatment is usually looked at follow up visits as opposed to a set in stone decision going forward.
Steroids are put into a few patients’ treatment plans which have retinal swelling. Also laser treatment is used for certain complications which present itself when abnormal blood vessel growth is seen. At the retina evaluation and also looking at the whole of the eye health the ophthalmologist will choose out the best CRVO treatment.
Follow up is a key component of central retinal vein occlusion treatment. Routine exams allow the specialist to note if retinal swelling is reducing, what other treatments may be needed, and if new complications have appeared. Patients are to keep to their review schedules and report any changes in vision which may occur. This also makes central retinal vein occlusion treatment a more dynamic and responsive process.
| Treatment approach | Main purpose |
| Anti-VEGF injections | Help reduce retinal fluid leakage and macular swelling. |
| Steroid treatment | May help control retinal swelling in selected patients. |
| Laser treatment | May be used for particular CRVO complications. |
| OCT and retinal follow-up | Monitor retinal changes and response to treatment. |
Can CRVO Be Prevented?
Not all cases of CRVO eye disease are preventable. But there is value in the management of conditions which affect blood vessels as a way to support overall eye health. Blood pressure, blood sugar and cholesterol should be managed as appropriate, and there is also a role for close monitoring of glaucoma when it is present.
Those that had a central retinal vein blockage may require ongoing eye exams. Also, keeping up with follow up appointments will have the ophthalmologist at hand to monitor the retina and to also see early signs which may in turn play a role in central retinal vein occlusion treatment. It also gives the doctor a chance to look at the present plan and to see if other central retinal vein blockage risks should be looked into.
Conclusion
Central retinal vein occlusion usually comes out of the blue before you lose vision, but if caught and treated early, it is manageable. The recommended approach for central retinal vein occlusion treatment will depend on what is seen in the retina and may include anti-VEGF injections, steroids, laser therapy, or a watchful wait. If you notice sudden changes in vision in one eye, see your eye doctor as soon as possible.
At Vasan Eye Care an in depth retinal evaluation is presented which in turn may bring to light the cause of sudden visual changes and will put forth a tailored care plan. Our patients ask to follow up on the as recommended review schedule and to come in early should they experience change in vision again. Also put forth this approach which supports safe and evidence based central retinal vein occlusion treatment when it is indicated.
Frequently Asked Questions About CRVO
1. Is central retinal vein occlusion a medical emergency?
Sudden or unexplained vision loss which requires prompt assessment as it is a symptom of a few serious eye conditions.
2. What is the prognosis for vision loss after CRVO treatment?
In some patients vision does improve especially when there is retinal edema which is treated properly. Outcomes which include vision improvement or not, play a role in how severe and what type of CRVO it is.
3. Are anti-VEGF injections painful?
The eye is numbed prior to the procedure. Post injection there may be some temporary irritation or mild discomfort.
4. Is CRVO in both eyes common?
CRVO mostly affects a single eye but the other eye is checked as well in people with certain risk factors.
5. What is the duration of CRVO treatment?
There is no set time for treatment which may include a series of injections and follow up exams based on retinal response.