Seeing Spots or Shadows in Your Vision? Understanding Eye Floaters and How They Develop

Noticing small spots, threads, or shadow-like shapes drifting across your vision can be unsettling. These shapes often seem to move as your eyes move and may be more noticeable against bright or plain backgrounds, such as a clear sky, white walls, or digital screens.

These visual disturbances are usually known as eye floaters. They are very common and, in many cases, harmless. However, floaters can sometimes be linked to changes inside the eye that benefit from clinical evaluation. Understanding how floaters develop, what may cause them, and how eye care professionals assess them helps place these symptoms into the right context.

Please note that this content serves educational purposes only and does not replace professional medical advice. For persistent eye symptoms, we recommend booking a comprehensive eye examination at AccuVision.

Noticing New Floaters?

If you are seeing new spots, shadows, or flashes in your vision, a comprehensive eye examination including dilated retinal check is generally advised within 24-48 hours. You can arrange this with our expert team at AccuVision who can assess the vitreous and retina under controlled clinical conditions and complete specialised imaging of the retinal periphery.

What Are Eye Floaters?

Eye floaters are visual effects caused by small changes inside the eye rather than on its surface. They may appear as dots, strings, cobweb-like shapes, or faint shadows that drift across your field of vision.

Floaters originate from the vitreous humour, which is a clear, jelly-like substance filling the inside of the eye between the lens and the retina. The vitreous helps the eye maintain its shape and allows light to pass through to the retina. When small irregularities form within this gel, they can cast tiny shadows on the retina. The brain interprets these shadows as floaters.

What Do Eye Floaters Commonly Look Like?

People describe eye floaters in different ways, but common descriptions include:

• Small dark or grey dots
• Thin strands or thread-like lines
• Cobweb or cloud-like shapes
• Transparent shapes that drift with eye movement

Floaters often appear to move away when you try to look directly at them. This happens because they are suspended within the vitreous gel, which shifts slightly as the eyes move.

How Do Eye Floaters Develop With Age?

In most people, floaters develop due to natural age-related changes inside the eye.

Vitreous changes explained

As we age, the vitreous humour gradually changes:

• The gel begins to liquefy, becoming more watery.
• Collagen fibres (structural proteins within the vitreous) start to clump together.
• These clumps block small amounts of light and cast shadows on the retina.

This process explains the majority of floaters in eyes seen during routine eye evaluations.

Why Can a Sudden Increase in Eye Floaters Happen?

As the vitreous gel shrinks with age, it may pull away from the retina. This is called posterior vitreous detachment (PVD).

Key points about PVD:

• It is very common with ageing and usually occurs after 50.
• It often causes a sudden increase in floaters.
• It may be accompanied by brief flashes of light, especially in low-light conditions.
• It does not automatically mean that the eye is damaged, but signals risk which should be professionally investigated and sometimes monitored.

Although PVD itself is usually harmless, a clinical eye evaluation is important. An eye examination helps confirm whether the vitreous is or has separated safely and ensures that the retina remains healthy, without breaks, tears or other complications such a detachment, which could impact vision.

Other Causes of Eye Floaters

While age-related vitreous changes are the most common cause, floaters can also be associated with other eye conditions.

• Inflammation inside the eye (uveitis)Uveitis refers to inflammation affecting structures inside the eye. Inflammatory cells can enter the vitreous and appear as numerous small floaters.
• Bleeding inside the eyeBleeding into the vitreous can introduce blood cells that appear as floaters. This may occur following eye injury or due to conditions related to retinal blood vessels.
• Diabetic retinopathyThis is an eye condition caused by damage to the small blood vessels of the retina in people with diabetes. When these vessels leak or bleed, blood cells may enter the vitreous and be seen as floaters or similar visual disturbance.

In this context, floaters are assessed alongside:

• Retinal health
• Blood vessel changes
• Overall eye and systemic health findings

This is why floaters are always evaluated within the broader context of eye and general health rather than viewed in isolation.

Risk Factors Associated With Eye Floaters

Certain factors increase the likelihood of developing or noticing eye floaters:

• Advanced age: Age-related changes in the vitreous gel are the most common cause.
• Nearsightedness (myopia): The eye’s shape increases stress and potential retinal traction.
• Previous eye injury or eye surgery: Trauma or surgical changes can alter the vitreous structure.
• Inflammatory eye conditions: Inflammation can release debris into the vitreous.
• Diabetes and retinal blood vessel disease: Bleeding or retinal changes may lead to floaters.

These risk factors do not mean that floaters are harmful by default. In most cases, floaters are benign and related to natural ageing. However, their presence provides important clinical context, as certain risk factors increase the probability of associated retinal conditions, making eye evaluation essential.

Why Can Eye Floaters Seem Worse at Certain Times?

Many people notice that floaters appear more prominent on some days than others. This usually reflects changes in visibility, not changes within the eye itself.

Floaters are often more noticeable:

• Against bright or plain backgrounds
• During visual fatigue or prolonged screen use
• When attention is focused on vision

These fluctuations are common and can relate to perception rather than the progression of an eye condition.

How Do Eye Care Professionals Assess Eye Floaters?

When floaters are reported, eye care specialists focus on understanding their cause and clinical significance.

Evaluations commonly include:

• Examination of the vitreous
• Detailed retinal assessment, usually with a dilated exam
• Measurement of visual clarity
• Review of when floaters started and whether they have changed
• Assessment for associated visual symptoms

This structured approach ensures floaters are assessed accurately rather than assumed to be harmless or concerning without evidence. Clinical guidelines also suggest that anyone presenting with new-onset floaters or flashes requires a dilated retinal exam.

How Do Eye Care Specialists Approach Eye Floaters?

How floaters are managed depends on what is found during an eye evaluation, including a detailed dilated retinal check. In many people, floaters are linked to normal changes inside the eye and do not require active treatment. In these cases, they are observed over time, and often patients learn to ignore them, or they can disappear or new ones appear from time to time.

If floaters are related to another eye condition, attention is directed towards identifying and managing that underlying issue. Any discussion about further steps follows detailed assessment and is based on individual findings.

Living With Eye Floaters

Many people find that floaters become less noticeable over time as the brain gradually learns to ignore them. Awareness remains important, particularly if floaters change in number, size, or appearance.

Clinical evaluation helps ensure floaters are understood within the wider context of eye health.

When Is Further Eye Evaluation Commonly Recommended?

Further eye evaluation is commonly considered when floaters:

• Appear suddenly
• Increase noticeably
• Occur alongside other visual changes or flashes of light
• Obscure quality of vision or field of vision
• Interfere with everyday activities

Assessing these changes helps ensure eye health is maintained and potential concerns are identified early.

Conclusion

Eye floaters are a common visual experience that is most often linked to natural changes within the vitreous humour of the eye. Understanding how eye floaters develop, what causes them, how conditions such as diabetic retinopathy may be involved, and how specialists assess floaters in eye disease helps place these symptoms into perspective. While many floaters are harmless, clinical evaluation plays an important role when changes occur, supporting long-term eye health and reassurance.

Concerned About Vision Changes?

Sudden or increasing floaters should always be evaluated. Schedule a detailed eye examination at AccuVision for accurate assessment and personalised guidance.

This content was reviewed by Kareena Panthakey, BSc (Hons) MCOptom, part of the clinical team at AccuVision The Eye Clinic, a trusted UK-based clinic for comprehensive laser vision correction and specialised eye care for over 25 years. With expert Ophthalmologists and Optometrists across the UK, AccuVision ensures that every article reflects evidence-based eye health awareness. This content is for general educational purposes only and should not be construed as medical advice. Always consult a qualified eye care professional for personalised guidance and treatment for specific conditions.

FAQs

1. What causes eye floaters?

Eye floaters are most commonly caused by natural changes in the jelly-like substance inside the eye, particularly with age.

2. Are eye floaters always a sign of eye disease?

No. Most floaters are harmless and related to normal eye changes. Some may be linked to eye conditions, or signal risk of retinal changes, which is why assessment is important.

3. Why do floaters move when I move my eyes?

Floaters move because they are suspended within the vitreous gel, which can shift slightly as the eyes move.

4. Can diabetes cause eye floaters?

Yes. Diabetic retinopathy can cause floaters when damaged retinal blood vessels leak or bleed into the vitreous.

5. When should floaters be assessed by an eye care professional?

Floaters are commonly assessed when they appear suddenly, increase rapidly, or occur with other visual changes.