What we offer
Assessment of new flashes and floaters with your consultant.
Retinal laser and retinal surgery are not performed at our clinic. If treatment is needed, we arrange onward care without delay.
Flashes and floaters
Understand the findings.
Know your options and when to seek help.
Based on published clinical guidance · Last updated 29 October 2026
What should I do about new flashes or floaters?
New flashes or a sudden increase in floaters need urgent eye assessment, particularly with a shadow, curtain or reduced vision. These symptoms can come from a retinal tear or detachment, which needs prompt treatment. AAO advises examination of new symptoms rather than deciding they are harmless from how they look or whether the eye is painful. [13][14]
The Irish retinal guide describes floaters as drifting specks or threads and flashes as little sparks of light. Many have a less serious explanation, but a new pattern needs assessment. The useful distinction is not simply whether you have ever seen a floater before: tell the clinician what has changed, when it began and which eye is affected. [1]
If vision has suddenly dropped, a curtain is spreading or a shower of spots appears, seek urgent eye-care advice now. If you cannot reach an appropriate service promptly, attend an emergency department. Do not wait for a routine booking or drive yourself when sight is impaired. An online illustration or symptom checklist cannot exclude a retinal tear. [10][14]
What causes flashes and floaters?
The vitreous is the clear gel filling the back of the eye. With age, its structure changes and it can separate from the retina, called posterior vitreous detachment or PVD. This is different from retinal detachment: the gel separates in PVD, while a detached retina lifts away from its normal supporting position. [9]
Floaters can appear when clumps or strands within the vitreous cast shadows on the retina. They may look like threads, spots or cobwebs and are often more noticeable against a bright plain background. NEI also lists bleeding, inflammation and other eye problems among possible causes, so the appearance alone does not establish uncomplicated ageing changes. [8]
Flashes can occur when the vitreous pulls on the retina. Other visual effects, including migraine-related shimmering patterns, can have a different cause. Do not diagnose a first or changed episode as migraine without advice, particularly if it is accompanied by new floaters, missing vision or a curtain. The history and eye examination determine what needs attention. [13]
Is PVD the same as a retinal tear?
No; uncomplicated PVD means the vitreous has separated without an identified retinal tear or detachment. Many people need explanation and follow-up rather than a procedure. Cambridge University Hospitals describes how symptoms may persist but become less noticeable. This reassurance applies after assessment, not before a new episode has been examined. [11]
During separation, traction can sometimes create a tear in the retina. Fluid may then pass through a break and lift the retina away, causing a retinal detachment. A tear and a detachment are related but different findings, with different treatment discussions. An examination checks for these complications rather than assuming that the word detachment always means the same condition. [9][10]
Tell the clinician about short-sightedness, eye injury, previous cataract or retinal surgery, and a tear or detachment in either eye. These details can influence risk and follow-up. Symptoms and risk factors help guide assessment, but they do not provide a reliable personal percentage or remove the need to examine the peripheral retina. [3][14]
How common are retinal tears with symptomatic PVD?
In Nixon and colleagues’ community-referral study, retinal tears were present in 9.9% of eyes with symptomatic PVD at the first assessment. This is a result in people referred with symptoms, not the risk for every adult who has ever noticed a floater. It explains why a fresh episode deserves examination even when most eyes do not have a tear. [4]
The same study found a delayed tear rate of 3% by two months after the initial assessment. A clear first examination therefore does not guarantee that no later complication can occur. Keep the follow-up advice you receive and seek reassessment for new or worsening symptoms instead of relying on the earlier result to explain a later change. [4]
Large registry evidence also documents retinal problems appearing after the first PVD visit. Risk is higher with certain findings, such as bleeding, and the review plan should reflect the whole examination and history. Study averages support a safety plan; they should not be combined into a single personal forecast or treated as interchangeable estimates for different situations. [15]
How will the retina be examined?
A clinician checks your symptoms and vision and examines the eye, usually with dilated pupils. AAO emphasises a dilated retinal assessment when evaluating new flashes or floaters. Tell the team when symptoms started and whether vision is missing as well as blurred. Bring details of previous eye treatment, because the examination and risk assessment depend on the context. The tests described here are general diagnostic methods, not a promised first-visit package. [14]
The peripheral retina may need examination with a lens or gentle indentation to look for a break. The community study found that some tears were visible only with an indented examination. A macular OCT or a photograph alone is not equivalent to a complete peripheral retinal assessment, so a reassuring central scan does not automatically exclude a tear. [4][3]
If blood or another opacity prevents a clear retinal view, further assessment such as ultrasound may be needed. The clinician decides what is necessary and whether repeat examination is required. Dilation can blur sight and make driving unsafe temporarily, so arrange transport where needed and do not drive while your vision remains affected. [3][12]
Will I need another examination?
Follow-up depends on the findings and risk factors rather than one schedule for every floater. AAO recommends repeat examination within 6 weeks for acute PVD with particular risk findings, such as vitreous pigment, bleeding or visible traction, with prompt return for new symptoms. Some situations need earlier review; the agreed plan should be clear before you leave. [3]
A repeat examination checks for changes that were not present or visible initially. The IRIS registry study supports attention to delayed retinal pathology after PVD, especially in higher-risk eyes. Ask when to return, who will arrange the appointment and what symptoms should bring you back sooner. A review date is not permission to wait through a new curtain or loss of sight. [15]
For people with diabetes, symptoms also need assessment outside the screening timetable. HSE advises not waiting for the next Diabetic RetinaScreen appointment if sight changes. Screening photographs and an acute retinal examination serve different purposes; a recent normal screening result should not be used to dismiss fresh flashes, floaters or deterioration in vision. [2]
How are retinal tears treated?
Acute symptomatic horseshoe tears and traumatic breaks usually need treatment, according to AAO guidance. Laser or freezing treatment may be used to create an adhesion around an appropriate break and reduce the risk of fluid passing underneath the retina. The clinician explains which finding needs treatment, why it matters and what benefit and limitations to expect. [3]
Not every retinal hole or area of lattice degeneration needs preventive treatment. Cochrane found no eligible trials establishing preventive benefit for asymptomatic breaks and lattice in its reviewed evidence. This does not mean that a fresh symptomatic tear should be ignored. The symptoms, type of lesion and retinal examination distinguish very different clinical decisions. [5][3]
Treatment of a tear does not guarantee that another break cannot develop. Follow the return precautions and the review plan after laser or freezing, and report a new shower of floaters, flashes, missing vision or a curtain. Continued symptoms can have several explanations; the treating team should decide whether another examination or treatment is needed. [3]
What if the retina is detached?
Retinal detachment needs urgent specialist assessment because delayed repair can threaten vision. The type, extent and involvement of the central retina affect the surgical discussion. AAO emphasises early recognition, particularly before the macula is involved. Do not estimate urgency from whether the eye hurts or from comparing your shadow with a picture online. [3][10]
Repair can involve vitrectomy, a buckle or other approaches selected for the eye. A gas bubble may be used in some operations, with specific positioning and activity restrictions. NHS information warns that flying may need to be avoided when gas is present. Obtain the surgeon’s instructions rather than applying a general timetable from another person’s procedure. [10]
The aim is to reattach the retina and protect useful vision, but the final visual result depends on the eye and existing damage. Further treatment may be needed. A previous repair does not make later symptoms harmless, so seek advice for recurrence rather than assuming that a new curtain cannot represent another retinal problem. [10][3]
What if floaters remain troublesome?
After uncomplicated PVD, floaters may remain visible but become easier to live with. Cambridge University Hospitals describes this course, while NEI notes that many age-related floaters do not require treatment. Discuss persistent interference with reading, work or everyday tasks at review, after serious causes have been excluded, rather than assuming every floater requires removal. [11][8]
Vitrectomy can remove vitreous opacities in selected people, but its potential benefit must be balanced against surgical risks. Laser vitreolysis is a different intervention and is not the laser used to seal a retinal tear. A consultation should identify the cause, impact and suitable options before discussing an elective procedure for longstanding symptoms. [6][8]
Cochrane’s older review did not establish whether laser or vitrectomy is better in a direct comparison. A separate small sham-controlled trial found symptom improvement for selected Weiss-ring floaters after laser, while calling for larger, longer studies. These are different comparisons; neither establishes that elective treatment is suitable for all floaters or has no important risks. [6][7]
What about driving, exercise and travel?
Driving depends on your actual visual function and the findings, not simply on the label PVD. Do not drive while dilation or symptoms impair sight. Guy’s and St Thomas’ specifically warns against driving while vision is affected after examination. Tell the clinician if floaters obscure important tasks or if you have missing peripheral vision. [12]
Ask for activity advice that matches the diagnosis and any procedure. Uncomplicated PVD is not the same as a retinal tear, a detachment or an eye containing a postoperative gas bubble. Restrictions after surgery can be important, while a blanket rule copied from an operated eye may not describe someone whose examination found uncomplicated vitreous separation. [11][10]
If you plan to travel or may have difficulty returning, discuss the follow-up and urgent-care route before leaving. Keep the examination outcome and return instructions available. New symptoms need reassessment wherever you are; distance from the original clinic is not a reason to wait for a planned appointment if a curtain, shower of spots or loss of vision develops. [3][12]
Which changes should bring me back urgently?
Seek urgent assessment for a sudden shower or increase of floaters, new or increasing flashes, a spreading shadow or curtain, or a drop in vision. These are recognised warning symptoms of a retinal tear or detachment. An earlier reassuring examination reduces uncertainty about that moment; it does not establish the cause of symptoms that appear later. [13][11]
Contact the treating team promptly if pain, redness or blur worsens after retinal treatment. NHS guidance advises hospital review for deterioration after repair. If the eye service is unavailable, attend an emergency department. Do not assume that a serious complication must be painful or that worsening vision is expected simply because an operation was recent. [10]
For stable longstanding floaters without a new change, discuss their impact through the agreed care route. For a sudden new episode, use urgent assessment rather than routine symptom monitoring. The animated points on this page illustrate the vitreous and retina; they do not reproduce your sight, measure a tear risk or replace an examination. [8][14]
At Limerick Eye Clinic
Care at our clinic
What to bring
Your glasses, a list of your medicines and any previous letters or reports. A referral letter can be uploaded with your appointment request.
Get in touch
+353 61 52 6664
reception@limerickeyeclinic.ie
Your questions
What should I do if flashes or floaters suddenly appear?
Seek urgent eye assessment for new flashes or a sudden increase in floaters, particularly with a shadow, curtain or reduced vision. AAO advises examination of new symptoms because a tear or detachment is possible. Do not wait for a routine booking or decide they are harmless because the eye is comfortable. Use an emergency department if appropriate eye care is unavailable. [13][14]
What are floaters?
Floaters are shapes you notice when material inside the vitreous casts shadows on the retina. NEI describes spots, threads and cobweb-like forms that move with the eye. Many are related to ordinary vitreous changes, but bleeding, inflammation and retinal problems can also cause them. A new or changed pattern needs assessment rather than a diagnosis from appearance alone. [8]
Why do I see flashes when no light is there?
Pulling of the vitreous on the retina can create the sensation of a flash without an external light. AAO explains this mechanism, but other visual effects can have different causes. Tell the examiner whether the pattern is new and whether there are floaters or missing vision. Do not assume a first or changed episode is migraine without advice. [13]
What is posterior vitreous detachment?
PVD is separation of the vitreous gel from the retina, rather than detachment of the retina itself. NEI explains that age-related changes can make the vitreous fibres pull away. It often needs no treatment if uncomplicated, but the process can sometimes cause a retinal tear. The examination checks for that complication before reassurance is appropriate. [9]
References
Irish care context, specialist guidance and clinical studies. Published outcomes describe the studied populations, not this clinic’s outcomes.
- Fighting Blindness; ICO-hosted guide. A Guide to Conditions of the Retina. 2014. Publisher source
- HSE National Screening Service. Diabetic RetinaScreen: patient questions. 2024. Publisher source
- American Academy of Ophthalmology. PVD, Retinal Breaks and Lattice Degeneration PPP 2024, published 2025. 2025. Publisher source
- Nixon, Davie and Snead. Posterior vitreous detachment and retinal tear: prospective community referrals. 2024. Publisher source
- Cochrane Eyes and Vision. Interventions for asymptomatic retinal breaks and lattice degeneration. 2014. Publisher source
- Cochrane Eyes and Vision. Nd:YAG vitreolysis versus vitrectomy for floaters. 2017. Publisher source
- Shah and Heier. YAG vitreolysis versus sham for symptomatic floaters. 2017. Publisher source
- National Eye Institute. Floaters. 2024. Publisher source
- National Eye Institute. Vitreous detachment. accessed 2026. Publisher source
- NHS. Detached retina. accessed 2026. Publisher source
- Cambridge University Hospitals NHS Foundation Trust. Posterior vitreous detachment. 2026. Publisher source
- Guy’s and St Thomas’ NHS Foundation Trust. Posterior vitreous detachment. 2026. Publisher source
- American Academy of Ophthalmology. What Are Floaters and Flashes?. 2025. Publisher source
- American Academy of Ophthalmology. Retinal detachment: recognition, examination and triage. 2025. Publisher source
- IRIS Registry investigators. Timing of delayed retinal pathology after acute PVD. 2023. Publisher source
Based on published clinical guidance · Last updated 29 October 2026
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