IMPLANT INFORMATION about Eye Implants

  
What … for? (Indications)
Eye anatomy

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Intraocular Lenses (IOL)IOLs are used at cataract or myopia.
–   Anterior chamber lensesPhakic (remaining natural lens). Refractive lenses are used for myopia, presbyopia and high hyperopia, if laser or corrective lens treatment is not done.
 
–   Posterior chamber lensesAphakic (no lens). Used at cataract, the replacement of the natural lens.
 
Glaucoma Filtration DeviceGlaucoma filtration devices are used to control intraocular pressure (IOP), at previously failed trabeculectomy, at insufficient conjunctiva, scarring and complicated glaucomas.
 
Artificial Iris/RetinaPartial or complete aniridia
Capsular tension ringCataract, a.o.
Special implants
–   Diplopia Implant
–   Pupil Dilator
–   Implants for Children
 
Epiretinal ProsthesisBlindness
Eye ProsthesesTrauma, Cancer
Numbers
Global 19Mio 2010, 19.7Mio 2012 IOL
Cataracts account for 48% of world blindness.
Germany: 650.000 Cataract surgeries/year
Times
Recovery from the procedure is usually within 24 hours.
ContraindicationsbehavioralSpecific job requirements (e.g. pilot, public service vehicle). Night vision important. Low change of myopia.
some may be relative 
medicalRetinitis pigmentosa. Stargardt disease. Macular diseases. Any abnormality of the optic nerv. Fuchs corneal dystrophy. Macular degeneration. Diabetes mellitus.
 
Risksduring surgeryMechanical trauma
short termNo improvement, infection (0.03-0.05%), rotation of the lens, lose of vision.
 
long termSecondary cataract (0.6%), yearly loss of 1.8% of the endothelial cells, retinal detachment, corneal swelling (0.4%). Glaucoma, Glare, Halo (FDA)
 
restrictionsLoss of accommodation, minimized with multifocal lenses (slight double vision, reduced contrast), difficulty with performing tasks like driving at night or in fog.
 
FailuresMechanical trauma, infection, optical problems
MaterialIntraocular LensesHydrophilic (25%) acrylic, hydrophobic acrylic, hydrophilic with hydrophobic surface, PMMA
 Light adjustable lensSilicone + Macromers sensitive to ultraviolet light
Artificial Iris–   Polymer fiber meshwork (for suturing)
–   Fiber free
Capsular Tension RingPMMA
Aniridia RingsBlack pemA
Cornea ImplantsCornearingCeralloy-Titanium
Glaucoma Filtration Device, valved/nonvalvedStainless steel, Acrylics
Epiretinal ProsthesisAntenna, electronic case, electrode array
Eye ProsthesesGlass
StatisticsNo longterm studies with appropriate numbers available.
 
Literature–   BasicPhakic Intraocular Lenses
Capsular tension ring:
Tribus C et al: Indications and clinical outcome of capsular tension ring (CTR) implantation: A reviw of 9528 cataract surgeries, Clin Ophtalmol v.1(1), 2007 Mar
 
–  Problems13.88% developed clinically relevant cataracts (with IOL, older model)
Half of explantation were caused by cataract. Alio et al. Phakic intraocular lens explantation: causes in 240 cases. J Refract Surg. 2015 Jan; 31(1): 30-5.
–  Science/FutureLight adjustable lenses
Medical societiessee here
 
CriticismPMMA vs foldable lenses, Hard vs Soft

FDA: What are he risks?

 
Selected patient informationsEyeWiki™
Register for patientsn/a
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