CONDITION
Retinal Detachment
Retinal detachment describes the separation of the retina—the light-sensitive layer at the back of the eye—from the tissue beneath it. When this happens, the retina can no longer function normally, and vision is affected. In dogs and cats, this can occur suddenly or develop over time, and may affect one eye or both. Owners often notice changes in how their pet moves through familiar spaces: hesitation, bumping into objects, or reluctance to navigate in dim light. The pupil may appear unusually large, and in some cases the eye itself may look different—cloudy, enlarged, or with visible changes behind the clear front surface. These signs can appear quite suddenly, or they may develop more gradually depending on what is driving the detachment. This page explores what these changes in vision and eye appearance can signal, the range of underlying processes that can lead to retinal detachment, how the condition is investigated through examination and imaging, and the approaches that exist once a detachment has been identified.
Why this matters now
Retinal detachment can occur at any age, but certain patterns tend to emerge in particular groups. Younger animals may experience detachment linked to inherited conditions affecting retinal structure or blood pressure regulation, whilst older dogs and cats more often develop detachment secondary to chronic conditions such as high blood pressure, immune-mediated inflammation within the eye, or changes in the vitreous gel that fills the eye. Some dog breeds—including Shih Tzus and Labrador Retrievers—appear more frequently in clinical reports, reflecting inherited predispositions. In cats, retinal detachment is not strongly associated with any particular breed and is instead driven predominantly by systemic hypertension secondary to chronic kidney disease or hyperthyroidism. In many cases, the detachment itself is not the starting point but rather a consequence of another process that has been unfolding quietly for weeks or months.
The speed at which retinal detachment develops varies considerably depending on what is driving it. In cases linked to sudden blood pressure spikes or acute bleeding within the eye, vision can deteriorate over hours to days. When the underlying cause is a slow-growing mass, gradual inflammation, or progressive degeneration of the vitreous, the detachment may take weeks to become complete, and owners may notice subtle changes in behaviour before the eye itself appears obviously abnormal. Once the retina has separated, the degree of vision loss depends on how much of the retinal surface is affected and how long it has been detached, as the retinal cells begin to lose function when deprived of their normal contact and nutrient supply.
Signals & patterns
Early signals
Hesitation in familiar spaces
An animal that previously moved confidently through the home may begin to slow down, pause before stepping off furniture, or navigate corners more carefully. This often reflects a reduction in depth perception or peripheral vision as the detachment begins to affect how the retina processes visual information.
Reluctance in low light
Owners may notice their pet is less willing to go outside at dusk, or becomes uncertain in rooms with dimmed lighting. Partial retinal detachment can reduce the eye's ability to adapt to changes in brightness, making low-contrast environments more difficult to interpret.
Unusually wide pupils
One or both pupils may appear larger than usual and may not constrict normally when a light is shone towards the eye. This can occur when the detached retina is no longer able to signal the brain effectively, disrupting the normal reflex that controls pupil size.
Misjudging distances
A pet may overshoot when reaching for a toy, hesitate before jumping, or misstep on stairs. These moments can indicate that the brain is receiving incomplete or distorted visual input from the affected eye.
Later signals
Obvious bumping or disorientation
As more of the retinal surface detaches, vision loss becomes more pronounced. Animals may walk into furniture, fail to notice people approaching from one side, or appear confused in previously familiar spaces.
Cloudiness or colour change in the eye
In some cases, fluid accumulates within the eye or inflammation develops, causing the normally clear structures to appear hazy, bluish, or milky. This can be visible when looking directly at the eye and may indicate that the detachment has been present for some time or is accompanied by secondary complications.
Enlargement of the eye
Fluid build-up behind the detached retina or changes in the pressure within the eye can cause the globe itself to appear larger or more prominent. This may be subtle or quite marked, depending on the underlying cause and how long the process has been active.
Click to read about the biological mechanisms
How this is usually investigated
Investigation typically begins with a detailed history—when vision changes were first noticed, whether they appeared suddenly or gradually, and any recent illness or medication. The veterinary surgeon then examines the eye directly, often using a bright light and magnification to look through the clear structures at the front and assess the retina at the back. Further tests are guided by what is seen during that examination and what the history suggests about underlying causes.
Ophthalmoscopy
Blood pressure measurement
Ocular ultrasonography
Blood biochemistry and haematology
Referral ophthalmology examination
Options & trade-offs
Management depends on what is driving the detachment, how much of the retina is affected, and how long the separation has been present. In many cases, the focus is on addressing the underlying cause—such as controlling blood pressure or reducing inflammation—rather than attempting to reattach the retina surgically. Different combinations of approaches may be workable depending on the individual animal, the owner's circumstances, and the clinical picture.
Systemic blood pressure control
When hypertension is identified as a contributing factor, medication to lower blood pressure can reduce further vascular damage and fluid leakage. This may involve daily oral medication, dose adjustments over weeks, and periodic blood pressure monitoring. The aim is to stabilise the eye and limit progression, though existing detachment may not reverse.
Trade-offs: Blood pressure medication requires consistent administration and follow-up, and some animals tolerate certain drugs less well than others. Lowering blood pressure can help prevent detachment in the other eye, but it does not restore vision that has already been lost.
Anti-inflammatory therapy
In cases where immune-mediated inflammation or uveitis is present, oral or topical anti-inflammatory drugs—often corticosteroids or other immunosuppressive agents—may be used to reduce fluid accumulation and structural damage within the eye. The regimen may involve an initial higher dose, then gradual tapering, with monitoring for side effects and response.
Trade-offs: Long-term use of these medications can carry risks including increased thirst, weight gain, and susceptibility to infection, and not all animals respond equally. Inflammation control can prevent further detachment but may not restore retinal function if the cells have already been damaged.
Surgical reattachment
In selected cases, particularly where a retinal tear is identified early and the detachment is recent, surgical techniques may be considered to reposition the retina and seal any breaks. These procedures are typically performed by specialist ophthalmologists and may involve laser, cryotherapy, or injection of gases or oils into the eye.
Trade-offs: Surgery carries risks including anaesthesia, infection, and recurrence of detachment, and the success rate varies depending on the underlying cause and duration of detachment. It is not suitable for all types of detachment, and even when the retina is reattached, vision recovery is not guaranteed if the photoreceptor cells have degenerated.
Supportive management without reattachment
When the detachment is longstanding, extensive, or driven by an irreversible process, the focus may shift to maintaining the animal's comfort and managing any secondary complications such as glaucoma or chronic inflammation. This can involve topical medications, pain relief if needed, and adaptations to the home environment to help the animal navigate safely.
Trade-offs: This approach does not restore vision, and some owners find it difficult to watch their pet adjust to blindness. Many animals adapt remarkably well over time, particularly if the detachment is bilateral and the loss of vision is complete, as they learn to rely on other senses.
Enucleation
Removal of the eye may be considered if the detachment has led to painful complications that cannot be controlled with medication, such as severe glaucoma or chronic inflammation. The procedure is permanent and involves general anaesthesia and a recovery period, after which the socket heals and the animal adapts to monocular or no vision.
Trade-offs: This is a significant step and is usually reserved for situations where the eye is painful and non-visual, and where other options have been exhausted or are not feasible. Many owners find the cosmetic change difficult, though the animal's quality of life often improves once pain is removed.
Common misconceptions
"If the retina is reattached surgically, vision will return to normal."
Reattachment can restore the retina's position, but vision recovery depends on how long the retina was detached and how much the photoreceptor cells have degenerated in that time. In many cases, even successful reattachment results in only partial vision or no functional improvement, particularly if the detachment was longstanding.
"Retinal detachment is always painful, and a blind eye must be removed."
Retinal detachment itself is not typically painful; discomfort arises when secondary complications such as glaucoma or inflammation develop. Many animals live comfortably with detached retinas and reduced or absent vision, and removal is only considered when pain cannot be managed by other means.
"Once one eye has detached, the other eye will inevitably follow."
Whilst some underlying causes—such as high blood pressure or systemic inflammation—can affect both eyes, the second eye does not always develop a detachment. Addressing the underlying condition and monitoring the other eye closely can reduce the risk, though the outcome varies between individuals.
Related conditions
Uveitis
Uveitis—inflammation inside the eye—can lead to retinal detachment when inflammatory processes weaken the attachments between the retina and underlying tissue, or when fluid accumulates beneath the retina. Conversely, retinal detachment itself may trigger secondary inflammation within the eye.
Glaucoma
Glaucoma and retinal detachment can occur together, either because elevated pressure inside the eye stretches and damages retinal attachments, or because some underlying conditions—such as uveitis or lens displacement—can lead to both elevated pressure and detachment.
Lens Luxation
When the lens moves out of position, it can disrupt the normal anatomy inside the eye in ways that may lead to retinal detachment, particularly if the lens shifts backwards or if secondary inflammation or pressure changes develop.
Sudden Acquired Retinal Degeneration Syndrome (SARDS)
Both SARDS and retinal detachment can present with sudden vision loss, and distinguishing between them often requires detailed examination of the retina itself, as SARDS involves degeneration of light-sensing cells rather than physical separation of the retinal layers.
Hyphaema
Blood in the front chamber of the eye may signal trauma, inflammation, or bleeding disorders that can also affect structures at the back of the eye, including the retina and the tissue beneath it, and in some cases both hyphaema and retinal detachment arise from the same underlying event.
Understanding the range of processes that can lead to retinal detachment may prompt questions about how blood pressure, inflammation, or inherited conditions are monitored and managed more broadly. The immune and inflammatory health section offers context on how the body's response systems can influence the eye and other organs. Observations about how an animal is adapting to vision changes, or what secondary signs have appeared, can be useful information to bring to ongoing care conversations.