Eye & EarICD-10: H33.0Uncommon, but one of the more frequent sight-threatening eye emergencies, mainly affecting adults over 50

Retinal Detachment

Also known as: Detached retina

Retinal detachment happens when the retina, the light-sensing layer at the back of the eye, pulls away from the tissue underneath that supplies it with oxygen and nutrients. Once separated, the retina stops working properly and vision in that area is lost. It is a medical emergency: without prompt repair, the detachment can spread and cause permanent blindness in the affected eye. Most cases begin with a small tear or hole that lets fluid slip behind the retina. The warning signs are usually painless, which is why knowing them matters: a sudden shower of floaters, flashes of light, or a shadow creeping across your vision should be treated as urgent.

At a Glance

Common symptoms
A sudden increase in floaters (specks, threads, or cobwebs drifting across vision), Flashes of light in one or both eyes, often at the edge of vision, A dark shadow or curtain spreading across part of your visual field
Main treatments
Laser treatment (photocoagulation) or freezing (cryopexy) to seal a tear before it becomes a detachment, Pneumatic retinopexy: a gas bubble injected into the eye to push the retina back into place, Scleral buckle surgery: a silicone band placed around the eye to relieve pulling on the retina
Category
Eye & Ear · Uncommon, but one of the more frequent sight-threatening eye emergencies, mainly affecting adults over 50
See a doctor if
A sudden burst of new floaters or flashes of light: seek same-day eye care

Symptoms

A sudden increase in floaters (specks, threads, or cobwebs drifting across vision)
Flashes of light in one or both eyes, often at the edge of vision
A dark shadow or curtain spreading across part of your visual field
Blurred or distorted vision that comes on quickly
Loss of side (peripheral) vision
No pain, even as vision changes

Causes

  • A retinal tear from the vitreous gel shrinking and tugging on the retina with age (the most common cause)
  • Fluid build-up under the retina from inflammation, injury, or tumours
  • Scar tissue pulling on the retina, often from advanced diabetic eye disease
  • Eye injury or trauma
  • Complications of previous eye surgery, such as cataract removal

Risk Factors

  • Age over 50
  • Severe short-sightedness (high myopia)
  • Previous retinal detachment in the other eye, or a family history
  • Previous eye surgery or serious eye injury
  • Diabetic retinopathy or other retinal diseases
  • Thinning of the retina (lattice degeneration)

Diagnosis

  • Dilated eye examination to view the retina directly
  • Ultrasound of the eye if bleeding blocks the view of the retina
  • Optical coherence tomography (OCT) imaging to map the retinal layers
  • Assessment of the other eye for tears or weak spots

Treatment

  • Laser treatment (photocoagulation) or freezing (cryopexy) to seal a tear before it becomes a detachment
  • Pneumatic retinopexy: a gas bubble injected into the eye to push the retina back into place
  • Scleral buckle surgery: a silicone band placed around the eye to relieve pulling on the retina
  • Vitrectomy: removing the vitreous gel and replacing it with gas or oil to hold the retina flat
  • Strict head positioning after surgery as instructed, to keep the gas bubble in the right place
  • Avoiding air travel and high altitudes while a gas bubble is in the eye
  • Supportive: follow-up eye exams to catch any new tears early, and protective eyewear for sports

Prevention

  • Have regular dilated eye exams, especially if you are very short-sighted or have diabetes
  • Wear protective eyewear for contact sports, DIY, and hazardous work
  • Keep blood sugar well controlled if you have diabetes
  • Learn the warning signs and seek care the same day they appear
  • Have retinal tears treated promptly when they are found

When to See a Doctor

  • A sudden burst of new floaters or flashes of light: seek same-day eye care
  • A shadow, curtain, or grey veil moving across your vision: this is an emergency
  • Sudden blurring or loss of vision in one eye
  • Any of these symptoms after an eye injury or recent eye surgery
  • New symptoms in the other eye if you have had a detachment before

Frequently Asked Questions

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Medical Disclaimer: This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.

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