Trabeculectomy has little impact on IOL power calculations

Issue: January 25, 2016

Trabeculectomy had a minimal effect on IOL power calculation despite significant changes in axial length and corneal power, according to a study.

The prospective study included 34 eyes of 31 patients with a mean age of 53.35 years who were scheduled to undergo primary trabeculectomy.

Noncontact biometry was used to calculate IOL power with the Hoffer Q, Holladay and SRK/T formulas 1 day before surgery and 3 months and 6 months after surgery.

Mean IOP decreased significantly, from 18.53 mm Hg preoperatively to 9.5 mm Hg at 3 months and 9.12 mm Hg at 6 months (both P < .001). IOP was 6 mm Hg or lower in 12 eyes; two eyes developed hypotony maculopathy.

Mean axial length decreased by 0.14 mm at 3 months and 6 months from the preoperative value of 23.6 mm; the decreases were statistically significant (both P < .001).

Mean corneal power increased significantly from baseline at 3 months (P < .001) and 6 months (P = .008).

Changes in axial length and corneal power from 3 months to 6 months after surgery were not statistically significant.

Calculated IOL power at 3 months and 6 months after surgery was not significantly different from preoperative values, despite significant changes in axial length and corneal power. – by Matt Hasson

Disclosure: The authors report no relevant financial disclosures.

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Source:

Pakravan M, et al. Eur J Ophthalmol. 2015;doi:10.5301/ejo.5000604.