Retinal Detachment

The retina is a thin layer of light-sensitive tissue lining the back of the eye. It works much like the film in a camera, converting light into electrical signals that travel along the optic nerve to the brain, where they are interpreted as the images we see. Retinal detachment occurs when this layer separates from the underlying tissue that supplies it with oxygen and nutrients. Once detached, the affected part of the retina is cut off from its blood supply and rapidly stops functioning — which is why retinal detachment is a true ophthalmic emergency, not a condition that can safely wait for a routine appointment.

Retinal detachment is uncommon, affecting roughly 1 in 10,000 people each year, but the consequences of delay are severe and often irreversible: the longer the retina remains detached, particularly if the detachment progresses to involve the macula (the small central area responsible for sharp, detailed vision), the lower the chances of recovering good vision even after successful surgery. With prompt treatment, however, the large majority of retinal detachments can be successfully repaired, and many patients recover good, functional vision.

How a Retinal Detachment Actually Happens

Most retinal detachments do not appear out of nowhere — they are usually the end point of a process that begins with a normal, age-related change inside the eye.

Posterior Vitreous Detachment: The Usual First Step

The middle of the eye is filled with a clear, gel-like substance called the vitreous, which is attached to the retina in several places. With age, the vitreous gradually shrinks and becomes more liquid, eventually separating from the retinal surface — a normal process called posterior vitreous detachment (PVD), which affects most people by their 60s and 70s and, on its own, does not damage vision. As the vitreous detaches, however, it can tug on areas where it remains firmly attached to the retina. In most people this tugging causes no lasting harm, but in some, it is forceful enough to tear the retina.

From a Retinal Tear to a Detachment

When the retina tears, liquefied vitreous gel can pass through the tear and seep underneath the retina, gradually separating it from the tissue beneath — the underlying mechanism of the most common type of retinal detachment (rhegmatogenous, described below). This is why sudden new flashes and floaters, the hallmark symptoms of an acute PVD or retinal tear, deserve prompt assessment: identifying and treating a retinal tear before it progresses to a full detachment can prevent the detachment altogether.

Types of Retinal Detachment

The types of retinal detachment you may experience include:

• Rhegmatogenous: This is the most common type of retinal detachment and may happen as you grow older. It happens when a small tear in your retina results in the buildup of fluid behind it. This build up pushes the retina away, detaching it from the back of your eye.
• Tractional: This type of retinal detachment happens when scar tissue on your retina pull it away from the back of your eye. Diabetes is a common cause for this type of retinal detachment.
• Exudative: This type of retinal detachment happens when there is a build up of fluid behind the retina even though there is no tear. The main cause for fluid build up are leaking blood vessels or swelling behind the eye which may be due to conditions such as uveitis.

Symptoms of Retinal Detachment

Symptoms often develop suddenly and tend to progress in a recognisable sequence, though not everyone experiences every stage, and progression can happen over hours or over several days.

• New floaters — small dark spots, threads, or cobweb-like shapes drifting across your vision, sometimes appearing as a sudden shower
• Flashes of light (photopsia), often described as brief lightning streaks or flickers, particularly noticeable in dim lighting or peripheral vision
• A shadow or dark curtain spreading across part of your field of vision, which typically starts at the edge (periphery) and moves inward
• Progressive loss of peripheral (side) vision
• Sudden blurring or a significant drop in vision, particularly if the detachment has reached the macula
• A sensation of looking through a wavy or rippling curtain, sometimes described by patients as "a veil" over part of their sight

Crucially, retinal detachment is typically painless. The absence of pain is one reason symptoms are sometimes dismissed or delayed — but sudden flashes, a new shower of floaters, or a shadow in your vision should always be treated as urgent, regardless of whether there is any discomfort.

Why Timing Is Everything: Macula-On vs Macula-Off Detachment

One of the most important concepts in retinal detachment — and one rarely explained to patients — is the distinction between a macula-on and a macula-off detachment, because it has a major bearing on visual outcome and on how urgently surgery is pursued.

• Macula-on detachment: The detachment has not yet reached the macula, the small central area responsible for sharp, detailed vision (used for reading, recognising faces and driving). Central vision is usually still preserved at this stage, and surgery is typically treated as an emergency to be performed as soon as possible — often within 24 hours — specifically to prevent the detachment from progressing to involve the macula.
• Macula-off detachment: The detachment has already spread to involve the macula, and central vision is usually significantly affected. While surgery is still needed, and generally performed within a few days, the visual outcome tends to be less predictable than macula-on cases, and some degree of permanent reduction in central vision or visual distortion can remain even after the retina is successfully reattached — particularly the longer the macula has been detached before surgery.

This is the single biggest reason ophthalmologists urge patients not to "wait and see" with new flashes, floaters or a shadow in their vision — the difference of even a day or two can determine whether central vision is fully preserved.

Risk Factors for Retinal Detachment

• Age: Most common between ages 40 and 70, corresponding to when posterior vitreous detachment typically occurs, though it can happen at any age, including in children after significant eye trauma.
• Myopia (short-sightedness): Short-sightedness stretches and thins the eye, making the retina more fragile and prone to tears — even mild to moderate myopia meaningfully raises risk, and the risk rises further with high (severe) myopia.
• Personal history of retinal detachment: Retinal detachment in one eye significantly increases the risk of a future detachment in the other eye, and having had one previous detachment increases the risk of a further one.
• Previous eye surgery, particularly cataract surgery: Cataract surgery, even when uneventful, is associated with a small but recognised increase in retinal detachment risk, particularly in the following one to two years and especially in eyes that are also myopic.
• Significant eye injury: Blunt or penetrating trauma can cause immediate retinal tears or detachment, or contribute to detachment appearing months later.
• Family history: Having a first-degree relative with retinal detachment increases personal risk, reflecting an inherited tendency toward retinal thinning or early vitreous changes.
• Existing retinal or eye conditions: Areas of thinning at the retinal periphery (lattice degeneration), retinoschisis (splitting of retinal layers), and uveitis (eye inflammation) all increase the likelihood of a retinal tear or detachment.
• Diabetic eye disease: Poorly controlled diabetes can lead to abnormal blood vessel growth and scar tissue on the retina, which can pull the retina away from the back of the eye (tractional retinal detachment).

Possible Complications

• Permanent partial or complete vision loss in the affected eye if treatment is delayed or the detachment is extensive
• Reduced central vision or visual distortion (metamorphopsia) even after successful surgery, particularly following macula-off detachment
• Proliferative vitreoretinopathy (PVR): The formation of scar tissue on the retina after a detachment or its repair, which can contract and cause the retina to re-detach — the most common cause of surgical failure and, at times, further surgery.
• Recurrent or new retinal detachment, either in the same eye or, less commonly, the other eye
• Development or progression of cataract, particularly following vitrectomy surgery
• Elevated eye pressure (glaucoma), particularly when silicone oil or gas has been used during surgery
• Persistent floaters, mild double vision, or changes in glasses prescription following gas bubble use or scleral buckle placement

How Retinal Detachment is Diagnosed

• Dilated Eye Examination: Eye drops widen the pupil so the ophthalmologist can examine the retina in detail using specialised lenses, checking for tears, holes, and the extent of any detachment — this remains the primary way retinal detachment is diagnosed.
• Ocular Ultrasound (B-scan): Used when a clear view of the retina is not possible directly, such as when there is bleeding inside the eye (vitreous haemorrhage) or a cloudy lens, allowing the detachment to still be identified and mapped.
• Optical Coherence Tomography (OCT): A detailed, non-invasive cross-sectional scan of the retina, particularly useful for assessing whether the macula is involved and for planning and monitoring recovery after surgery.
• Visual Acuity & Visual Field Testing: Measures how much central and peripheral vision has already been affected, providing a baseline to compare against after treatment.
• Assessment of the Fellow Eye: Because of the increased risk of detachment in the other eye, a thorough examination of the unaffected eye is also carried out to look for tears, thinning, or other risk factors that might benefit from preventive treatment.

What Recovery from Retinal Detachment Looks Like

Recovery from retinal detachment surgery is not simply a matter of resting the eye — for many patients it involves an active, sometimes demanding, period of specific positioning and precautions in the days and weeks after surgery, which meaningfully affects the surgery's success.

• Head positioning: If a gas bubble was used, you will usually be asked to keep your head in a specific position — often face-down or angled to one side — for much of the day for several days to a week or more, so the bubble presses against the treated area of the retina while it heals. This can be physically demanding, and special pillows or supports are often provided to help.
• Avoiding air travel and altitude: If a gas bubble has been placed in the eye, air travel and travel to high altitudes must be avoided until the bubble has fully absorbed (which can take several weeks, depending on the type of gas used), as changes in air pressure can cause a dangerous rise in eye pressure. Your surgeon will confirm when it is safe to fly.
• Gradual visual recovery: Vision is often blurred immediately after surgery, and may fluctuate for some weeks as the eye heals, any gas bubble absorbs, and swelling settles. It is not unusual for the final visual outcome to only become clear after several months.
• Activity restrictions and eye drops: Strenuous activity, heavy lifting and swimming are usually restricted for a period after surgery, and eye drops are typically needed for several weeks to reduce inflammation and prevent infection.
• Follow-up appointments: Regular follow-up visits are essential in the weeks and months after surgery to confirm the retina remains attached, monitor eye pressure, and check for early signs of complications such as new scar tissue or cataract progression.

Can Retinal Detachment Be Prevented?

Rhegmatogenous retinal detachment itself cannot be entirely prevented, since it often begins with the normal, age-related process of vitreous separation. However, several steps can meaningfully reduce risk or allow problems to be caught and treated before a full detachment develops:

• Regular dilated eye examinations, particularly if you are short-sighted, over 40, or have a family history of retinal detachment, can identify retinal thinning or tears before they progress
• Seeking urgent assessment for any new flashes, floaters or shadow in your vision — treating a retinal tear early can often prevent a full detachment altogether
• Wearing protective eyewear during contact sports, racquet sports, and higher-risk occupational activities
• Keeping diabetes well controlled, with regular diabetic eye screening, to reduce the risk of tractional retinal detachment
• Attending recommended follow-up after cataract surgery or other eye procedures, given the modestly increased detachment risk in the following year or two
• Having the other eye assessed after a retinal detachment, given the significantly increased risk to the fellow eye