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Tips for Advanced Cataract Surgery Michael Reynard, M.D. Posterior Capsule Tears If the posterior capsule tears during cataract surgery, the natural tendency is to continue phacoemulsification and remove as much of the nucleus as possible before resorting to mechanical irrigation-aspiration or vitrectomy. However, this approach may extend the capsular tear and worsen prolapse of vitreous. When confronted with a capsular tear, consider this alternative approach:
a) On recognizing a tear in the posterior capsule, STOP! Suspend
b) Infuse viscoelastic in the anterior chamber to maintain the anterior chamber and
tamponade the hyaloid face. Use the viscoelastic to separate the posterior capsule from nuclear lens fragments. Using the phaco tip or other instruments, move nuclear lens fragments into angle of the anterior chamber. The isolated nuclear fragments will not drop into the vitreous with the iris as a barrier.
c) Remove residual cortex with a 27-guage canula on a 3-mL syringe. Do not use
the mechanical irrigation-aspiration unit at this time since it tends to exacerbate capsular tearing and vitreous prolapse into the anterior chamber.
d) Insert a three-piece lens implant in the ciliary sulcus (a one-piece lens implant is
unstable without an intact capsular bag). Use miochol or miostat to constrict the pupil.
e) Resume phacoemulsification. A constricted pupil and intact lens implant serves as
an effective barrier to prevent vitreous prolapse and displacement of cataract material into the vitreous.
Viscodissection Hydrodissection creates a plane of cleavage between the cortex and capsule. Separation of the cortex and capsule creates a “safety zone” that prevents the ultrasound from the phaco probe from injuring the posterior capsule. A plane of cleavage also allows for rotation of the nucleus within the capsular bag. The addition of viscoelastic between the cortex and capsule (viscodissection) may enhance safety of cataract surgery by producing greater separation of the cortex and capsule, and also by providing a cushion that absorbs ultrasound energy. This is particular useful with high-energy emulsification of a hard nucleus close to the posterior capsule. Viscodissection technique: First apply hydrodissection as usual with BSS. Using a small canula, carefully inject viscolelastic while moving the canula under the lip of the anterior lens capsule in a sweeping motion. It is important to inject viscolelastic slowly since too forceful an injection may damage the posterior lens capsule. A fluid wave as seen with hydrodissection is not necessary; the presence of viscoelastic in four quadrants is sufficient.
Tips for Advanced Cataract Surgery Trypan Blue The FDA has approved Trypan Blue for staining of the anterior capsule. Staining of the capsule can enhance visibility of the anterior capsule, especially in cases of advanced white cataracts. Trypan Blue also thickens the lens capsule. Thickening of the lens capsule with Trypan Blue can be very helpful in cases of advanced cataracts when the capsule is suspected as being very thin and friable. Be sure to use Trypan Blue and not Methylene Blue for intraocular applications since Methylene Blue can be very toxic to the corneal endothelium. Flomax Flomax (tamsulosin) is a medication that is used to treat benign prostatic hypertrophy (BPH). Since 2005, ophthalmologists have become increasing aware that patients who have been treated with Flomax may develop Floppy Iris Syndrome. Floppy Iris Syndrome is characterized by: 1) Poor preoperative dilation, 2) Iris billowing and tendency for prolapse during eye surgery, and 3) Progressive intraoperative miosis. It is important to understand that patients who have been treated with Flomax may exhibit all or just a portion of these features to varying degrees. Also keep in mind that intraoperative problems related to Flomax do not have a relationship to the duration or timing of Flomax treatment. Creating an incision that has wide clearance from the base of the iris helps avoid iris prolapse. Be prepared to apply iris hooks or insert a Malyugin pupil dilator for patients who have been treated at any time in the past with Flomax. For more surgical tips go to www.reynardmd.com
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