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Floaters: What are those "mosquitoes" in front of your eyes all about?
Created on 05.15
On a clear day, you look up at the sky;
In bright light, you stare at a computer or phone screen;
On brightly lit paper, you read books or documents;
In sunny weather, you drive;
If you notice small black dots, wavy lines, or cobweb-like clusters floating in your field of vision—
This is what is known as floaters.
01. Discovering Floaters
Floaters, also medically known as vitreous opacities or vitreous syneresis, are...
They are black dots, fine lines, cobwebs, rings, or small insect-like shapes that appear in your field of vision when you move your eyes.
They drift with eye movement and quickly "escape" when you try to focus on them.
In reality, these are not real mosquitoes or dust, but shadows cast on the retina by changes within the vitreous humor of the eye.
🔍 Simple explanation:
In youth, the vitreous humor is like uniform jelly, supporting the eyeball's shape and maintaining clear vision.
As age increases (or due to factors like myopia), it liquefies and shrinks, causing collagen fibers within to clump together.
These clumps are like small flocculent substances in water. When light passes through, they cast moving "shadows" on the retina.
02. Why does the vitreous age?
The vitreous humor is a transparent, colorless, gel-like, spherical structure that makes up about 80% of the eyeball's volume.
Its main components are water, collagen (primarily type II collagen), and glycosaminoglycans (mainly hyaluronic acid).
The mechanism by which aging leads to vitreous liquefaction has not been fully elucidated, but current research clearly indicates it is directly related to the following two points:
🔹(1) Excessive oxidative stress
- Aging, diet, lifestyle, pollution, UV radiation, etc., can all lead to
free radical accumulation.
- When free radicals exceed the body's antioxidant capacity, it triggers
oxidative stress, damaging eye health.
- Reactive Oxygen Species (ROS)
Excessive, leading to oxidative damage and degradation of the vitreous matrix (collagen, hyaluronic acid).
✅ Intervention Directions: Prevent further oxidative damage through diet or continuous antioxidant supplementation.
🔹 (2) Increased Proteolytic Enzyme Activity
- With aging, within the vitreous
proteolytic enzyme activity is enhanced, directly degrading collagen fibers and glycosaminoglycans.
- This leads to fiber aggregation, vitreous matrix disintegration, and accelerated liquefaction.
- This enzymatic hydrolysis is often exacerbated by oxidative stress, accelerating degeneration.
✅ Intervention Directions: Supplement matrix components to strengthen vitreous structure.
03. Impact of Floaters: Psychological Stress > Intrinsic Harm
Floaters are a common physiological aging phenomenon that most people experience in their lifetime.
They generally do not cause serious vision impairment but can lead to discomfort in daily life, such as:
- Interfering with reading and driving
- Affecting the appreciation of scenery
- Long-term persistent visual disturbances may lead to
Anxiety and stress
⚠️ Situations Requiring Vigilance:
When the number of floaters is large, increases suddenly, or the field of vision darkens, it may indicate progression of vitreous degeneration or other serious eye problems, requiring prompt medical attention.
04. High-Risk Groups Needing More Attention to Eye Health
👵 (1) Elderly Population
The incidence in people over 60 can reach over 60%. In the general population, 1 in 5 people have floaters. In the elderly, at least 1 in 2 people have floaters.
📌 The older you are, the higher the risk. Pay special attention if you are over 45.
👓 (2) People with high myopia
The risk significantly increases for those with high myopia (above -6.00 diopters).
Elongation of the eyeball makes the vitreous more prone to separation, so floaters are becoming increasingly common in young people with myopia.
📱 (3) Phone addicts
Excessive exposure to blue light emitted from mobile phones, tablets, and LCD screens may accelerate the onset of floaters.
Staring at screens for long periods, insufficient sleep, and staying up late are causing floaters to appear even at a young age.
05. What should be done to stay away from floaters?
✅ Reduce screen time on mobile phones and computers, and avoid playing on your phone with the lights off.
✅ Ensure sufficient sleep and try not to stay up late.
✅ Appropriately supplement the eye with necessary nutrients.
Maintain a balanced diet, eat more seafood rich in trace elements like iodine, zinc, and selenium, as well as fruits and vegetables rich in vitamin A. ✅ Carefully choose eye drops and colored contact lenses, avoiding irritating ingredients from entering the eyes. ✅ Drink more water to relieve eye dryness. ✅ Maintain a good mood and strengthen exercise.
References
1. Phillips JD, Hwang ES, Morgan DJ, Creveling CJ, Coats B. Structure and mechanics of the vitreoretinal interface. *J Mech Behav Biomed Mater.* 2022 Oct;134:105399.
2. Le Goff MM, Bishop PN. Adult vitreous structure and postnatal changes. *Eye (Lond).* 2008 Oct;22(10):1214-22.
3. Swindle, K. E., & Ravi, N. (2007). Recent advances in polymeric vitreous substitutes. *Expert Review of Ophthalmology,* 2(2), 255-265.
4. Sauvage, F., Nguyen, V.P., Li, Y. et al. Laser-induced nanobubbles safely ablate vitreous opacities in vivo. *Nat. Nanotechnol.* 17, 552-559 (2022).
5. Ankamah E, Sebag J, Ng E, Nolan JM. Vitreous Antioxidants, Degeneration, and Vitreo-Retinopathy: Exploring the Links. *Antioxidants (Basel).* 2019 Dec 20;9(1):7.
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