Ultrasound biomicroscopy of silicone posterior chamber phakic intraocular lens for myopia

Abstract

Phakic refractive lens implantation should be done carefully because of the sulcus location of the haptics in many cases. This, with the iris-PRL contact, suggests caution for the long-term outcome.

Sulcus anatomy and diameter in pseudophakic eyes and correlation with biometric data: Evaluation with a 50 MHz ultrasound biomicroscope

“…Several studies [15][16][17][18][19] have evaluated the relationship between WTW and STS diameters in an effort to select adequately sized posterior phakic IOLs. Using different devices to measure the STS and the WTW, they showed a weak correlation (r Z 0.406 to r Z 0.597) between these 2 values.…”

“…Surprisingly, to our knowledge, no data on the STS diameter in pseudophakic patients have been published. In contrast, many studies [15][16][17][18][19][20][21] report the sulcus anatomy in young phakic patients with the goal of optimizing the sizing and vault of posterior chamber phakic IOLs. Other studies 22,23 report the sulcus anatomy in aphakic eyes with a scleral-fixated IOL to evaluate and optimize the IOL position.…”

Iris and trabecular meshwork pigment changes after posterior chamber phakic intraocular lens implantation

“…Also, positioning the ICL on the exact desired location (sulcus) will produce fewer problems over the long term. 29 …”

The posterior chamber phakic refractive lens (PRL): a review

“…Indeed, a study carried out using ultrasonography in eyes implanted with PRL demonstrated a significant variability in the location of the pIOL, with the existence of contact areas between the haptics of the myopic PRL and the zonule in 50% of cases analysed. 41 The power calculation is carried out by the manufacturer according to the spherical equivalent (SE) obtained preoperatively, considering a distance between the trial frame and the eye of 12 mm. The exact algorithm used for this specific calculation is not provided by the manufacturer, but it could possibly be quite similar to that used for power calculations of other types of pIOLs (Van der Heijde formula).…”

“…However, it has been found that both PRL positions may coexist for the same implant in the same eye. 40,41 Stabilization of the PRL over the zonule promotes lens rotation whereas its position in the ciliary sulcus leads to an increase in the anterior convexity of the pIOL, thus reducing anterior chamber depth and narrowing the iridocorneal angle.…”