Night Vision Issues: Possible Causes and Tests Explained - Ophthalmology

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Night vision issues can be quite concerning, especially when they interfere with daily activities or cause anxiety about one's health. It sounds like you have already taken some important steps by consulting with eye doctors and undergoing examinations. Let's break down the possible causes of your night vision problems, the tests mentioned, and the implications of night blindness.


Possible Causes of Night Vision Issues
1. Refractive Errors: Since you mentioned having myopia (nearsightedness) of about 800 degrees, this could significantly affect your vision, especially in low-light conditions. Myopia can cause difficulty seeing distant objects clearly, and if not corrected with glasses or contact lenses, it may also impact your ability to see well at night.

2. Vitamin A Deficiency: Vitamin A is crucial for the production of rhodopsin, a pigment in the retina that helps you see in low light. A deficiency can lead to night blindness.

3. Genetic Factors: Given your family history of night blindness (your mother's grandfather), it is possible that you may have a hereditary condition affecting your night vision. Conditions such as retinitis pigmentosa can cause progressive vision loss, particularly in low-light situations.

4. Other Eye Conditions: Conditions like cataracts or glaucoma can also affect night vision. Cataracts can cause glare and halos around lights, making it difficult to see at night.


Tests for Night Vision Issues
You mentioned the terms EOG (Electrooculography) and EIG (Electroretinography). Here’s a brief overview of these tests:
- Electrooculography (EOG): This test measures the electrical potential of the retina. It can help assess how well your eyes are functioning in terms of movement and response to light. It is often used to evaluate retinal diseases.

- Electroretinography (ERG): This test measures the electrical responses of the retina's light-sensitive cells (rods and cones) when exposed to light. It can help diagnose conditions like retinitis pigmentosa or other retinal disorders that may affect night vision.


Genetic Considerations
Given your family history, it would be wise to discuss the possibility of genetic testing with your healthcare provider. If you are diagnosed with a hereditary condition, understanding the implications for your health and lifestyle is crucial.

Military Service Considerations
Regarding your question about military service, the requirements can vary significantly depending on the country and the specific branch of the military. In many cases, individuals with significant visual impairments, including night blindness, may be disqualified from certain roles. It would be best to consult with a military recruiter or a medical professional familiar with military standards to get accurate information based on your specific situation.


Conclusion
In summary, your night vision issues could stem from a combination of refractive errors, potential vitamin deficiencies, and hereditary factors. The tests suggested by your doctors, such as EOG and ERG, are essential for diagnosing the underlying cause of your symptoms. It is crucial to follow up with a specialist who can perform these tests and provide a comprehensive evaluation of your eye health. If you have concerns about your vision or its impact on your daily life, don't hesitate to seek further medical advice. Your vision is vital, and understanding its nuances can help you manage any issues effectively.