Pseudophakia | Ophthalmology | Video Lecture | Knowing Anatomy | Dr.Kareema Tabassum скачать в хорошем качестве

Pseudophakia | Ophthalmology | Video Lecture | Knowing Anatomy | Dr.Kareema Tabassum

Pseudophakia is a condition where an artificial lens, called an intraocular lens IOL, is implanted in the eye after the natural lens is removed. QUESTIONS AND ANSWERS! 1.what are the positive findings in a case of pseudophakia? A. history of diminution of vision followed by history of operation and improvement of vision --surgical scar at limbus over sclera or over cornea depending upon the type of surgery done --comparatively deep anterior chamber --pupil colour black with shinning reflex in pupillary area 2.what is pseudophakia? A. literally pseudo means artificial and phakia means lens so pseudophakia is an artificial lens. Usually it is implanted after extraction of Cataractous lens. Then the condition is called pseudophakia. 3.what are types of IOLs? A. depending upon the type of placement = anterior chamber and posterior chamber --depending upon the material = rigid and foldable --depending upon the correction they provide = mono, multifocal and accommodative 4.between anterior chamber and posterior chamber IOL which is better? A. posterior chamber IOL are better than anterior chamber IOL. as they are implanted in posterior chamber in a bag which is normal position of natural lens. --complications are less in posterior chamber IOLs. 5.What are the complications in anterior chamber IOLS? A. loss of endothelial cells leading to bullous keratopathy --uveitis, glaucoma and hyphaema - UGH syndrome 6.what are the complications of posterior chamber IOL implantation? A. complications of PC IOL are fewer -- over or under correction of power decantation of IOL leading to sunset syndrome, sunrise syndrome, lens lost syndrome-may be due to PC rent or zonular loss toxic lens syndrome may be due to ethylene oxide gas with which it is sterilized or due to lens material itself wind shield wiper syndrome due to large capsulorrhexis and small size of lens 7.what are the materials with which intra ocular lenses are made up of? A. rigid IOL are made up of PMMA foldable IOLs are made up of silicone, acrylic, hydrogel, cholomer, can be implanted in 2-2.2mm incision rollable IOL are ultrathin IOLs implanted through 1mm incision..these are made up of hydro gel. 8.what do u understand by unifocal, multifocal, accommodative IOL? A. unifocal-most commonly used having unifocal power. Depending upon the IOL implanted these can make patient emmetropic, myopic or hypermetropic multifocal-have separate optic to focus distant and near, also called pseudo accommodative IOL accommodative IOL- exhibit some anterior movement of optic to improve the near vision. so in multifocal or accommodative IOL patient need not use glasses for both distant and near in unifocal IOL patient need to use glasses for near 9.What do you understand by phakic IOL? A. in addition to aphakic IOL which are implanted after lens extraction special phakic IOL are required to treat refractive error. These are also called implantable contact lenses or ICLs. These are used for correction of myopia greater than 8D.in this technique special type of intra ocular lens can be implanted in the anterior chamber or posterior chamber anterior to natural crystalline lens. 10.can we correct pre existing astigmatism by IOL implantation? A. yes by toric IOLS 11.what do you understand by aspheric IOL? A. These are intra ocular lenses to reduce the spherical aberration 12.what do you understand by aniridia IOL? A. these are cosmetic device to cover the aniridia or partial loss or iris due to trauma .in these lenses around central optical part there is a black diaphragm. 13.what are parts of IOL? A. Optic for refraction and haptic for holding. 14.what is the size of IOL? A. from one end to other end they can be 12-12.5mm for back fixation 13 mm for sulcus fixation. Optic size can be 5.5, 6,6.5mm. 15. how will you sterilize the IOL? A. by ethylene gas 16. what do you understand by glued IOL? A. glued IOL are scleral fixation posterior chamber IOL and an alternative to anterior chamber IOL. these are implanted when there is no posterior capsule. Posterior chamber IOL can be fixated to sclera in ciliary sulcus region with the help of sutures or biological glue. 17.what is power of lens used in emmetropic eye? A. +18D