Visual Phenomena: Floaters and Blind Spots Explained

Q: Visual Phenomena: Floaters and Blind Spots Explained

Hello Andres： 1. <br>If it is floaters, there are no methods to reduce their occurrence frequency. <br>2. <br>The physiological blind spot is located just outside the center of the visual field and is generally at the same horizontal level as the center of the visual field. <br>I

Monocular vision obstruction at certain angles in the dark?

Hello, Doctor Gao.
I would like to ask you a couple of questions.
I have been experiencing floaters for about 20 years.
After undergoing laser treatment for a retinal tear, I have been consistently visiting the clinic for fundus examinations every six months, and my condition has been stable.
Here are my two questions:
1.
Throughout the day, I occasionally see small light spots rolling in an arc at the edge of my visual field.
I have searched through your past Q&A and it seems that if the examination shows no abnormalities, I should continue to monitor the situation.
However, I would like to know if there are any methods to reduce the frequency of these occurrences?
2.
I accidentally discovered that when I cover one eye in a dark room and observe the faint light source from the light switch, there are certain angles where I cannot see that light source.
Is this what is commonly referred to as the physiological blind spot? Or am I misunderstanding this? Should I undergo other tests in addition to the fundus examination? Thank you for your response!

Andres, 30~39 year old female. Ask Date: 2019/06/09

Dr. Gao Pilin reply Ophthalmology

Hello Andres: 1.
If it is floaters, there are no methods to reduce their occurrence frequency.
2.
The physiological blind spot is located just outside the center of the visual field and is generally at the same horizontal level as the center of the visual field.
If this is the case, the image may be falling right on the physiological blind spot.
If it occurs elsewhere, it is important to consider whether there is a visual field defect, and it is best to conduct a visual field test for assessment.
In Taiwan, at Puzi Hospital's ophthalmology department: Monday, Tuesday, Thursday, and Friday mornings from 8:00 AM to 12:00 PM, and Wednesday afternoons from 2:00 PM to 4:30 PM.
Online responses can only serve as a reference; it is necessary to seek medical attention at a healthcare facility.
I hope to have the opportunity to assist you.
Gao Pilin

Reply Date: 2019/06/09

More Info

Hello! Thank you for your questions regarding floaters and visual phenomena. It's great to hear that you've been proactive about your eye health, especially with your history of floaters and retinal laser treatment. Let's address your concerns one by one.

1. Seeing Small Light Spots: The small light spots you observe at the edges of your vision could be related to your floaters or possibly a phenomenon known as "entoptic phenomena." These are visual effects that occur within the eye itself, often caused by the shadows of floaters cast on the retina. While these occurrences can be bothersome, they are generally harmless, especially if your eye examinations have shown no signs of retinal detachment or other serious conditions.
To reduce the frequency of these visual disturbances, there are a few strategies you might consider:
- Eye Exercises: Some people find that regular eye exercises can help alleviate visual strain and improve overall eye comfort. Simple exercises include focusing on a distant object, then a near object, to help your eyes adjust.

- Lighting Adjustments: Ensure that you have adequate lighting when reading or working, as poor lighting can exacerbate visual disturbances.

- Hydration and Nutrition: Staying hydrated and maintaining a diet rich in antioxidants (like vitamins A, C, and E) can support overall eye health.

- Regular Check-ups: Continue your routine eye exams. If you notice any changes in the frequency or nature of your floaters, be sure to consult your ophthalmologist.

2. Physiological Blind Spot: The phenomenon you described, where you can’t see the light source at certain angles, is indeed related to the physiological blind spot. This blind spot is a natural part of the visual system, caused by the absence of photoreceptors where the optic nerve exits the eye. When you cover one eye and move it around, you may notice that certain light sources disappear from your view, which is a normal occurrence.
However, if you are experiencing this phenomenon more frequently or in a way that seems unusual, it might be worth discussing with your eye care provider. They may recommend additional tests, such as visual field testing, to assess your peripheral vision and ensure that there are no underlying issues affecting your sight.

In summary, while floaters and the physiological blind spot are common and usually benign, it’s essential to remain vigilant about any changes in your vision. Regular check-ups with your ophthalmologist are crucial, especially given your history of retinal issues. If you ever feel uncertain or notice new symptoms, don't hesitate to reach out for a thorough evaluation. Your eye health is paramount, and staying informed is the best way to manage your condition. Thank you for your questions, and I wish you continued stability and good health with your vision!

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