We don't have synonyms for phaco yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pharo, chaco and placo.
(n) :
(surgery, ophthalmology, informal) Clipping of phacoemulsification. [(surgery) A form of 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, thus maintaining the anterior chamber, as well as cooling the handpiece.]
(n) :
(surgery, ophthalmology, informal) Clipping of phacoemulsification. [(surgery) A form of 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, thus maintaining the anterior chamber, as well as cooling the handpiece.]