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Tip of the Month
Tip of the month - Perimetry should be undertaken soon after phacoemulsification and multifocal IOL implantation in patients with glaucoma, in order to establish new baseline parameters
Perimetry should be undertaken soon after phacoemulsification and multifocal IOL implantation in patients with glaucoma, in order to establish new baseline parameters

Publishing date: February 2014

Tip Editors: John Salmon and Gordana Sunaric M├ęgevand
Tip reviewer: Roger Hitchings


The Science behind the Tip

To determine change in visual function in patients with glaucoma, regular visual field testing is undertaken using automated static perimetry.  When interpreting the visual field results the effect of refractive error (particularly uncorrected hyperopia) and cataract formation should be considered, as these factors can result in a change in threshold measurements (1,2).

A recent study has shown that the use of multifocal implants can cause a diffuse change in the visual field of approximately - 2dB, which is not found when standard implants are used.  Patients with glaucoma who undergo phacoemulsification and multifocal IOL implantation should undergo perimetry soon after surgery in order to establish new base-line measurements (3).

Contributor: John Salmon, Oxford



References

1. Weinreb RN, Perlman JP.  The effect of refractive correction on automated perimetric thresholds.  Am J Ophthalmol 1986; 101 (6) 706-709.

2. Chen PP, Budenz DL.  The effects of cataract extraction on the visual field of  eyes with chronic open-angle glaucoma. Am J Ophthalmol 1998; 125 (3) 325-333.

3. Aychoua N, Junoy Montolio FG, Jasonius NM. JAMA ophthalmology 2013; 131: 481-485



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