Optical Quality after Posterior Chamber Phakic Implantation of an Intraocular Lens with a Central Hole (V4c Implantable Collamer Lens) under Different Lighting Conditions
Background: The current study compared optical quality before and after implantation of a posterior chamber phakic intraocular lens with a central hole V4c implantable collamer lens (ICL) under bright and dark lighting conditions by means of the Optical Quality Analysis System™ (OQAS; Visiometrics, Terrassa, Spain). Methods: This prospective study involved 91 eyes of 46 consecutive high myopia patients (15 males and 31 females, average spherical equivalent -10.50±0.33D) undergoing implantation of a V4c ICL. The modulation transfer function (MTF) cutoff frequency, Strehl ratio, objective scattering index (OSI), and predicted visual acuities (PVAs; 100%, 20%, and 9%), under different lighting conditions, were measured before and 1 week, 1 month, and 3 months after surgery. Results: All optical parameters showed significant improvements, at all time points, under dark condition after surgery. We observed no significant changes in PVA 9% at 1 week (mean value 0.539, P=0.12) or 1 month after surgery (mean value 0.573, P=0.08) under bright condition; but all other postoperative parameters improved significantly. Comparing the two lighting conditions, the OSI decreased more under dark conditions at 1 week (P=0.02), 1 month (P=0.004), and 3 months (P=0.002), but there was no significant difference in any other parameter. In addition, patients were divided into super high myopia (group S, spherical equivalent greater than -10 D) and high myopia (group H, spherical equivalent from -6 D to -10 D), the group S improved significantly more than group H in all parameters, under both bright and dark conditions. Conclusions: V4c ICL implantation improved optical quality under both bright and dark lighting conditions, and had a better ability to reduce the extent of scattering in the dark. Furthermore, group S achieved greater improvement in visual quality, which should be considered by physicians before surgery.
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Posted 02 Jan, 2020
Received 07 Feb, 2020
On 31 Jan, 2020
Invitations sent on 31 Jan, 2020
On 27 Dec, 2019
On 26 Dec, 2019
On 26 Dec, 2019
On 06 Dec, 2019
Received 03 Dec, 2019
On 14 Nov, 2019
Received 24 Oct, 2019
Invitations sent on 23 Oct, 2019
On 23 Oct, 2019
On 23 Jul, 2019
On 22 Jul, 2019
On 22 Jul, 2019
On 21 Jun, 2019
Received 20 Jun, 2019
On 03 Jun, 2019
On 04 May, 2019
Received 04 May, 2019
On 20 Apr, 2019
On 20 Apr, 2019
Invitations sent on 20 Apr, 2019
On 10 Apr, 2019
Optical Quality after Posterior Chamber Phakic Implantation of an Intraocular Lens with a Central Hole (V4c Implantable Collamer Lens) under Different Lighting Conditions
Posted 02 Jan, 2020
Received 07 Feb, 2020
On 31 Jan, 2020
Invitations sent on 31 Jan, 2020
On 27 Dec, 2019
On 26 Dec, 2019
On 26 Dec, 2019
On 06 Dec, 2019
Received 03 Dec, 2019
On 14 Nov, 2019
Received 24 Oct, 2019
Invitations sent on 23 Oct, 2019
On 23 Oct, 2019
On 23 Jul, 2019
On 22 Jul, 2019
On 22 Jul, 2019
On 21 Jun, 2019
Received 20 Jun, 2019
On 03 Jun, 2019
On 04 May, 2019
Received 04 May, 2019
On 20 Apr, 2019
On 20 Apr, 2019
Invitations sent on 20 Apr, 2019
On 10 Apr, 2019
Background: The current study compared optical quality before and after implantation of a posterior chamber phakic intraocular lens with a central hole V4c implantable collamer lens (ICL) under bright and dark lighting conditions by means of the Optical Quality Analysis System™ (OQAS; Visiometrics, Terrassa, Spain). Methods: This prospective study involved 91 eyes of 46 consecutive high myopia patients (15 males and 31 females, average spherical equivalent -10.50±0.33D) undergoing implantation of a V4c ICL. The modulation transfer function (MTF) cutoff frequency, Strehl ratio, objective scattering index (OSI), and predicted visual acuities (PVAs; 100%, 20%, and 9%), under different lighting conditions, were measured before and 1 week, 1 month, and 3 months after surgery. Results: All optical parameters showed significant improvements, at all time points, under dark condition after surgery. We observed no significant changes in PVA 9% at 1 week (mean value 0.539, P=0.12) or 1 month after surgery (mean value 0.573, P=0.08) under bright condition; but all other postoperative parameters improved significantly. Comparing the two lighting conditions, the OSI decreased more under dark conditions at 1 week (P=0.02), 1 month (P=0.004), and 3 months (P=0.002), but there was no significant difference in any other parameter. In addition, patients were divided into super high myopia (group S, spherical equivalent greater than -10 D) and high myopia (group H, spherical equivalent from -6 D to -10 D), the group S improved significantly more than group H in all parameters, under both bright and dark conditions. Conclusions: V4c ICL implantation improved optical quality under both bright and dark lighting conditions, and had a better ability to reduce the extent of scattering in the dark. Furthermore, group S achieved greater improvement in visual quality, which should be considered by physicians before surgery.
Figure 1