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Purpose

Analyze the refractive error after IOL (Intra Ocular Lens) implantation in myopic patients and deduce the error that would have generated the use of different formulae.

Methods

We retrospectively analyzed the refractive outcome of 101 eyes of 69 myopic patients operated by phacoemulsification and IOL implantation between 2009 and 2011 at two different medical centers. All had AL (Axial Length) greater than 27mm. IOL power had been approximated prior to surgery by formulae obtained from non-contact laser biometer IOLMaster™ (Zeiss). We calculate deviation from emmetropia and the most accurate formula. 

Results

69.3% of the operated eyes had a residual refractive error within half diopter range, collecting 89.1% within the diopter of deviation. Average deviation from correct IOL power was +1.99D for HofferQ, +1.58D for Holladay; +1.31D for SRK-T, and +0.86D for Haigis. The differences were greater among formulas in the negative IOL group. 

Conclussion

To our knowledge, the Haigis formula calculates the most accurate IOL power in the great myopic. Constant customization should improve his accuracy.