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Cataracts

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  What is a cataract?
  
  A cataract is a clouding of the normally clear lens of the eye. It can be compared to a window that is frosted or fogged with steam.
  
  What causes cataract?
  
  Most commonly, cataracts are genetically transmitted from parents to offspring. Other cataracts are due to diabetes, ocular injuries and chronic ocular inflammation.
  
  How are cataracts treated?
  
  Surgery is the only way that cataracts can be removed. There are no medications or dietary supplements that have been shown to prevent or cure cataracts. Surgical removal of the cataract entails removal of the entire lens. This surgery is performed with your pet under general anesthesia using an operating microscope, microsurgical instruments, and a phacoemulsification unit. Basically, cataract surgery is performed the same way in dogs as it is performed in human beings.
  
  What is phacoemulsification?
  
  Phacoemulsification is the technique by which the lens is broken into tiny fragments with ultrasonic power. An ultrasound probe is introduced into the eye through a small incision, the lens is broken apart and the lens fragments are aspirated from the eye. This restores an optically clear window through which your dog can see.
  
  What is an intraocular lens?
  
  An intraocular lens implanted at the time of surgery replaces the focusing power of the natural lens that was removed. Dogs with artificial lenses implanted at the time of cataract surgery seem to have better vision than dogs without lenses. If the natural capsule that surrounds the lens is able to support an intraocular lens, one will be implanted. This is a decision that is made at surgery.
  
  What is the success rate?
  
  Approximately, 90% to 95% of dogs have good to excellent vision after surgery. Vision-threatening complications that may occur include retinal detachment and scar tissue formation. Thankfully, these complications are not common, and the vast majority of dogs see well after surgery.

  ©This information sheet was donated by Drs. Chavkin and Nuhsbaum of the Veterinary Referral Center of Colorado. To find out more about this hospital go to www.vrcc.com.