Common Eye Concerns: Sunglasses, Light Sensitivity, and Vision Health

Q: Common Eye Concerns: Sunglasses, Light Sensitivity, and Vision Health

Hello： 1) Wearing sunglasses for extended periods may have some effects on vision and eye health. <br>Sunglasses can reduce the stimulation from bright light, but if you wear them for long periods indoors or in dimly lit areas, it may cause issues with visual adaptation. <br>Addi

Regarding some questions and health education inquiries?

Hello, doctor.
I have some questions I would like to ask.

1) Previously, my cornea was scratched by an ingrown eyelash, which made me very sensitive to bright light.
After that, I got prescription sunglasses (dark brown).
I would like to know if frequently wearing sunglasses has any impact on my vision or eyes?
2) About three months ago, I had my eyes checked at a large hospital, and there seemed to be no significant issues.
However, when I close my eyes, especially when falling asleep at night, I can always feel light waves moving beneath my eyes, somewhat like waves crashing intermittently.
Is this normal?
3) A health information website mentioned that besides feeling pressure in the eyes, one can self-check intraocular pressure by gently pressing on the eyeball to assess its hardness (for example, if it feels as hard as the forehead, it may be too high).
Is this method of assessment reliable?
4) In the morning, after getting up and washing my face in the bathroom, I sometimes notice a visual disturbance that feels like my entire vision is vibrating when I blink in the dark.
However, this sensation seems to disappear after a minute or two or in brighter light.
What could this be? Thank you for reading.

Weizhi, 20~29 year old female. Ask Date: 2023/06/14

Dr. Gao Pilin reply Ophthalmology

Hello: 1) Wearing sunglasses for extended periods may have some effects on vision and eye health.
Sunglasses can reduce the stimulation from bright light, but if you wear them for long periods indoors or in dimly lit areas, it may cause issues with visual adaptation.
Additionally, if your sunglasses are not professionally prescribed, they may distort vision, leading to eye strain and discomfort.
It is recommended to use sunglasses in appropriate situations, such as in bright outdoor environments, while also ensuring moderate exposure to natural light to maintain visual health.
2) The sensation of light waves flowing beneath the eyes may require further evaluation.
However, this symptom could be related to refractive errors or retinal issues.
It may also be a form of photopsia, which is a physiological phenomenon.
3) Checking intraocular pressure by gently pressing on the eyeball with closed eyes is a very rough and unreliable method.
Accurate measurement of intraocular pressure requires specialized equipment.
4) When transitioning from a bright environment to a dark one, the eyes may need some time to adjust.
This phenomenon is known as "dark adaptation" and is a normal physiological response.
The eyes require time to adjust to changes in light.
If you only experience visual disturbances in the dark and not in bright areas, it may be because your eyes need more time to adapt to the dark environment.
If this phenomenon persists or affects your daily life, please seek further evaluation from an ophthalmologist.

Reply Date: 2023/06/14

More Info

When it comes to common eye concerns, particularly regarding sunglasses, light sensitivity, and overall vision health, it's essential to address each of your questions with a comprehensive understanding of eye care.

1. Wearing Sunglasses Regularly: After experiencing a corneal abrasion from an ingrown eyelash, it's understandable that you would be more sensitive to bright light. Wearing sunglasses, especially those with UV protection, is generally beneficial for your eye health. High-quality sunglasses can reduce glare and protect your eyes from harmful ultraviolet (UV) rays, which can contribute to cataracts and other eye conditions over time. However, if you wear sunglasses indoors or in low-light conditions, it may hinder your eyes' ability to adapt to varying light levels, potentially leading to discomfort or visual disturbances. It's crucial to use sunglasses appropriately, primarily in bright outdoor settings, while allowing your eyes to experience natural light in moderation.

2. Perception of Light Waves: The sensation of seeing light waves or patterns, especially when closing your eyes or during the transition to sleep, can be attributed to several factors. This phenomenon may relate to a condition known as "phosphene," where pressure on the retina or stimulation of the optic nerve can create visual sensations. While this can be normal, if it persists or is accompanied by other symptoms such as pain or significant visual changes, it would be wise to consult an eye care professional for a thorough evaluation.
3. Self-Checking Eye Pressure: The method of pressing on your closed eyelids to assess eye pressure is not a reliable technique. While it may provide a rough estimate of eye firmness, accurate measurement of intraocular pressure (IOP) requires specialized equipment, such as a tonometer. Elevated IOP can indicate conditions like glaucoma, which can lead to vision loss if not treated. Therefore, regular eye exams with a qualified eye care provider are essential for monitoring eye health and pressure accurately.

4. Visual Disturbances in Low Light: The experience of seeing visual disturbances, such as "visual shaking" or vibrations, when transitioning from bright to dark environments is often related to the eye's adaptation process. This phenomenon, known as "dark adaptation," occurs as your eyes adjust to lower light levels. It is normal for this adjustment to take some time, and the sensation should resolve as your eyes acclimate. However, if you frequently experience discomfort or if these disturbances interfere with your daily activities, it is advisable to seek further evaluation from an eye specialist.

In summary, while wearing sunglasses is generally beneficial for protecting your eyes from bright light and UV exposure, it's essential to use them appropriately. The sensations you're experiencing may be normal but should be monitored, especially if they persist or worsen. Regular eye check-ups are crucial for maintaining eye health, accurately measuring eye pressure, and addressing any concerns you may have. If you have ongoing issues or discomfort, don't hesitate to consult with an eye care professional for personalized advice and treatment options.

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