Position of myopic iris-claw phakic intraocular lens by Scheimpflug photography and ultrasound biomicroscopy

Abstract

Purpose To evaluate the position of iris-claw phakic intraocular lens (ICPIOL) in highly myopic eyes by Scheimpflug photography (SP) and ultrasound biomicroscopy (UBM). Methods Nine eyes of five patients aged 31710 years with average spherical equivalent of À16.0475.46 D (range À7.88 to À 22.88 D) were enrolled in this prospective study and implanted with Verisyse ICPIOLs (AMO). The anterior segment was evaluated by SP and UBM preoperatively and for at least 1 month postoperatively. The statistical significance may be questionable due to the limited number (nine) of eyes.Results By SP and UBM, the distance between corneal endothelium and lens (anterior chamber depth) preoperatively was 3.1070.14 and 3.0770.11 mm, respectively; between ICPIOL and corneal endothelium (pseudo-anterior chamber depth), 1.8870.09 and 1.9970.12 mm, respectively; between lens and posterior surface of ICPIOL (IL), 0.7670.13 and 0.6770.06 mm, respectively; between superior optic edge and iris (SOEI), 0.2370.23 and 0.5870.24 mm, respectively; between inferior optic edge and iris (IOEI), 0.0770.13 and 0.4170.22 mm, respectively; between ICPIOL haptics and the angle of anterior chamber (HA), 0.9070.17 and 1.4570.13 mm, respectively. ACD was well correlated between the two methods, but PACD, IL, OEI, HA were not. The postoperative measures, except IL, were significantly different between the two methods. Conclusion The differences between measurements by SP and UBM reveal the ICPIOL's position variations with change of body position. Nevertheless, it seems adequate that space is maintained between ICPIOL and corneal endothelium, angle, and crystalline lens. The ICPIOL implanted in phakic eyes seems a safe alternative for treatment of high myopia.

Comparative study of anterior segment measurements using 3 different instruments in myopic patients after ICL implantation

“…Nakakura [22] found that Pentacam measured significantly higher ACD value than UBM in healthy people. Yu [23] reported no significant difference between Pentacam and UBM in highly myopic eyes. On contrary, Nemeth [20] showed that Pentacam and UBM measured the same ACD values in phakic eyes, but Pentacam measured significantly shallower ACD values in pseudophakic eyes.…”

Alterations in the anterior chamber angle after implantation of iris-fixated phakic intraocular lenses

“…In addition, they observed haptic indentation of the iris. Using the Pentacam device and UBM, Yu et al 23 found that space was maintained between iris-fixated pIOLs and the corneal endothelium, angle, and crystalline lens in eyes with high myopia. In our study, the anterior chamber angle narrowed more than 5 degrees in 19 of 20 eyes (95%) after implantation of an iris-fixated pIOL.…”

Anterior Segment Disorders

“…Postoperatively, the position of the phakic IOL haptics as well as the distances from corneal endothelium to phakic IOL and from phakic IOL to crystalline lens can also be evaluated. [20][21][22][23][24][25]…”