Phacoemulsification

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Phacoemulsification is a modern cataract surgery in which the eye's internal lens is emulsified with an ultrasonic handpiece and aspirated from the eye. Aspirated fluids are replaced with irrigation of balanced salt solution to maintain the anterior chamber.

Video Phacoemulsification

Etymology

The term originated from phaco- (Greek phako-, comb. form of phakós, lentil; see lens) + emulsification.

Maps Phacoemulsification

Preparation and precautions

Proper anesthesia is essential for ocular surgery. Topical anesthesia is most commonly employed, typically by the instillation of a local anesthetic such as tetracaine or lidocaine. Alternatively, lidocaine and/or longer-acting bupivacaine anesthestic may be injected into the area surrounding (peribulbar block) or behind (retrobulbar block) the eye muscle cone to more fully immobilize the extraocular muscles and minimize pain sensation. A facial nerve block using lidocaine and bupivacaine may occasionally be performed to reduce lid squeezing. General anesthesia is recommended for children, traumatic eye injuries with cataract, for very apprehensive or uncooperative patients and animals. Cardiovascular monitoring is preferable in local anesthesia and is mandatory in the setting of general anesthesia. Proper sterile precautions are taken to prepare the area for surgery, including use of antiseptics like povidone-iodine. Sterile drapes, gowns and gloves are employed. A plastic sheet with a receptacle helps collect the fluids during phacoemulsification. An eye speculum is inserted to keep the eyelids open.

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Surgical technique

Before the phacoemulsification can be performed, one or more incisions are made in the eye to allow the introduction of surgical instruments. The surgeon then removes the anterior face of the capsule that contains the lens inside the eye. Phacoemulsification surgery involves the use of a machine with microprocessor-controlled fluid dynamics. These can be based on peristaltic or a venturi type of pump.

The phaco probe is an ultrasonic handpiece with a titanium or steel needle. The tip of the needle vibrates at ultrasonic frequency to sculpt and emulsify the cataract while the pump aspirates particles through the tip. In some techniques, a second fine steel instrument called a "chopper" is used from a side port to help with chopping the nucleus into smaller pieces. The cataract is usually broken into two or four pieces and each piece is emulsified and aspirated out with suction. The nucleus emulsification makes it easier to aspirate the particles. After removing all hard central lens nucleus with phacoemulsification, the softer outer lens cortex is removed with suction only.

An irrigation-aspiration probe or a bimanual system is used to aspirate out the remaining peripheral cortical matter, while leaving the posterior capsule intact. As with other cataract extraction procedures, an intraocular lens implant (IOL), is placed into the remaining lens capsule. For implanting a poly(methyl methacrylate) (PMMA) IOL, the incision has to be enlarged. For implanting a foldable IOL, the incision does not have to be enlarged. The foldable IOL, made of silicone or acrylic of appropriate power is folded either using a holder/folder, or a proprietary insertion device provided along with the IOL.

It is then inserted and placed in the posterior chamber in the capsular bag (in-the-bag implantation). Sometimes, a ciliary sulcus implantation may be required because of posterior capsular tears or because of zonular dialysis. Because a smaller incision is required, few or no stitches are needed and the patient's recovery time is usually shorter when using a foldable IOL.

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History

Charles Kelman introduced phacoemulsification in 1967 after being inspired by his dentist's ultrasonic probe.

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Research

A Cochrane Review seeking to determine whether glaucoma surgery combined with cataract surgery via phacoemulsification has any advantages over cataract surgery (via phacoemulsification) alone found that eyes that underwent combined (glaucoma and phacoemulsification) surgery had a significantly lower intraocular pressure (-1.62 mmHg) compared to eyes that underwent phacoemulsification cataract surgery alone. The authors note that this finding is not conclusive, as the studies examined had many differences and poor reporting outcomes.

A review of 16 trials seeking to compare the effectiveness of laser-assisted cataract surgery with standard ultrasound phacoemulsification found uncertain evidence suggesting benefits of one procedure over the other. A meta-analysis of more than 14500 eyes and 37 studies found no significant differences between the two techniques in terms of visual or refractive outcomes or overall complications.

Clinical trials comparing NSAIDs versus corticosteroids in the treatment of postoperative eye inflammation were uncertain, but there was a some evidence suggesting patients treated with NSAIDs were less likely to develop cystoid macular edema.

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References

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See also

• Eye surgery
• Africa Cataract Project

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External links

• Description and animation illustrating the phacoemulsification process
• Information on phacoemulsification training
• Cataract Surgical Training Programs in Jaipur, India

Source of the article : Wikipedia