Computational study of aqueous humor dynamics in two different models of posterior chamber phakic lenses

Session Details

Session Title: Presented Poster Session: Phakic IOLs

Session Date/Time: Monday 07/09/2015 | 09:30-10:50

Paper Time: 09:30

Venue: Poster Village: Pod 2

First Author: : A.Macarro Merino SPAIN

Co Author(s): :    J. Fernandez Francos   J. Fernandez-Vigo Escribano   C. Fernandez-Vigo Escribano   I. Almorin Fernandez-Vigo     

Abstract Details

Purpose:

To compare the behavior of aqueous humor (AH) and analyze flow differences between V4b and V4c implantable collamer lenses (ICLs)© depending on the pupillary diameter (PD)

Setting:

International Center of Advanced Ophthalmology, Madrid, Spain. University of Extremadura. Ophthalmology department.

Methods:

We utilized computational fluid dynamics (CFD) to compare the AH flow through an iridotomy which is typically performed after implantation of a V4b lens to that of the central hole of a V4c lens. The volume and flow rate in 4 scenarios were compared according to the type of lens and PD: 1) V4b with an iridotomy and a PD of 3 mm; 2) V4b with an iridotomy and a PD of 4.5 mm; 3) V4c with a central hole and a PD of 3 mm; 4) V4c with a central hole and a PD of 4.5 mm.

Results:

1)V4b lens with an iridotomy with a PD of 3 mm, the flow through the iridotomy represents 28.35% of the total flow rate with a velocity of 0.14 mm/sec. 2)Increasing the PD from 3 to 4.5 mm reduced flow through the iridotomy to 13.27% of total, with a velocity of 0.06 mm/sec.3)V4c lens with a 3mm PD flow through the central hole represents 22.7% of total, with a velocity of 0.13 mm/sec. 4)Increasing the PD from 3 to 4.5 mm reduced the flow through the central hole to 9.77% of total, with a velocity of 0.05 mm/sec.

Conclusions:

Aqueous humor flow varies depending on ICL© implanted. Flow was influenced by the presence of an iridotomy versus the presence of a central hole in the lens. Flow through the iridotomy (V4b) was greater than flow through the central hole (V4c), although V4c lenses seem to better simulate physiologic flow of aqueous humor in the eye. With both lenses, increasing pupillary diameter decreased the rate of aqueous humor through the iridotomy or central hole of the lens.

Financial Interest:

NONE