Capstone Project week#1

 Research 

Aqueous Drainage Device Fundamentals: Ahmed Glaucoma Valve - American Academy of Ophthalmology (aao.org)

  • gave basic steps of surgically implanting the Ahmed Glaucoma Valve 
  • surgery always begins with a traction suture 
  • makes fornix-based conjunction flap 
  • inserts plate of valve into pocket 
  • valve is sutured to sclera 
  • tube is cut down to size and inserted into anterior chamber 
  • conjunctiva is closed surgically
  • Glaucoma drainage surgery 
    • Purpose is to control pressure of eye 
  • IOP(intraocular pressure) 
    • if too high can damage optic nerve leading to vision resulting in blindness 
  • 90% long-term success many patients, after 2 years, require at least one glaucoma medication along with their implant 
  • Open-angle glaucoma and chronic glaucoma 
    • IOP needs to be lowered to retain vision 
    • scarring is also at high risk 
  • Ahmed Glaucoma Valve is often used 
  • alternative: Baerveldt Glaucoma Implants 
  • tude creates channels allowing fluid to flow from eye to bleb (filtering area)
  • Complications: 
    • failure to control eye pressure long term 
    • infection 
    • bleeding 
    • cataract 
    • erosion of tube 
    • require repeat of surgery 
  •  damage to optic nerve 
  • can occur at any age 


  • open-angle
    • patchy blind spots center or peripheral 
    • tunnel vision 
    • drainage angle formed by cornea and iris stays open 
    • trabecular network is partially block 
    • causes pressure to increase steeply
  • acute angle-closure 
    • eye pain 
    • blurred vision 
    • halos around lights 
    • eye redness 
    • aka closed-angle glaucoma 
    • iris bulges forward to narrow or block the drainage angle 
    • fluid cannot circulate through eye pressure 
    • pressure increases 
  • can be present from birth
Client Notes: 
  • Look at Solx for information 
  • wants device to have three levels: low, medium and high 
  • unique way of measuring pressure 
  • make surgery easy 
  • low pressure should shock valve to decrease flow 
  • high pressure should increase flow to release pressure 




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