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PRK (Photorefractive Keratectomy)

Clear vision is achieved when light falls on your cornea (transparent outer curved layer) and lens (flexible biconvex lens inside your eyes), which bend to focus the light on the photosensitive retina at the back of your eye. An abnormally curved cornea and lens fail to focus light on the retina, causing blurred vision. Photorefractive keratectomy is a procedure that uses laser to correct the shape of the cornea so that it focuses an image more accurately on the retina.

What are the indications of PRK?

The procedure is indicated when the cornea is curved too little (farsightedness), too steeply (near-sightedness) or irregularly (astigmatism).

What are the preoperative preparations?

If you use contact lenses, you may be asked to stop wearing them for a period of time prior to the procedure.

How is the procedure performed?

The procedure is performed under local anaesthesia and takes about 10 minutes to treat both eyes. A laser is directed on the cornea to correct its curvature. Your eyes are covered with a special contact lens bandage that remains in place for at least 3-4 days to allow the corneal surfaces to heal.

What will I experience following surgery?

You may experience some eye irritation and sensitivity to light for 2-3 days which is normal. Your doctor will prescribe eye drops to control pain, inflammation and infection. Vision may be blurry initially, but improves gradually over a period of weeks to months.

What are the risks associated with the procedure?

The procedure is mostly accurate but occasional complications include reduced vision, glaring and halo formation.

Intravitreal Injection

Intravitreal injection is a procedure where medicines are injected directly into the jelly-like material inside your eye known as the vitreous.

Why are these injections given?

Intravitreal injections are a common method to treat retinal diseases such as diabetic retinopathy, macular degeneration, macular oedema, and vein occlusions.

How is the procedure performed?

This procedure can be performed on an outpatient basis. Your doctor will first numb your eye with anaesthetic drops. Special instruments will be used to keep your eye open. Your eye will then be washed with an antiseptic solution. Depending on your condition, your doctor will then inject the appropriate medication directly into the vitreous of your eye. Your doctor will then check your eye and apply antibiotic ointment to prevent any infection. Some patients may need to have the procedure repeated at regular intervals in order to maintain good vision.

What will I experience following the procedure?

It is quite normal to feel pressure or mild discomfort during the procedure. Some patients may see floaters or develop bleeding or inflammation on the surface of your eye. These side effects may resolve spontaneously and can be managed easily using eye drops. However, some of the less common and more severe complications include retinal tear/detachment, bleeding in the eye, infection and formation of cataract.

Affiliations

  • The Royal Australian and New Zealand College of Opthalmologists
  • Australian Society of Opthalmologists
  • Perfect vision
  • The University of Sydney
  • ESPH
  • BJPH
  • NSW Health
  • University of Cambridge
  • UCL
  • Sydney Eye Hospital
  • AMA
  • AHPRA