Quality Changes in Fundus Images of Pseudophakic Eyes

Abstract

We consider the changes produced in the quality of eye fundus images of patients before and after cataract surgery with intraocular lens implantation and propose a measure to quantitatively assess those changes. Several factors concerning the optical system of the eye, the ocular media, and the specific characteristics of the implanted intraocular lens, may influence the quality of the digital image acquired with a non-mydriatic retinal camera. We illustrate our study with several cases taken from the clinical practice. A pair of pre-and post-operative eye fundus images represents each case. To measure image quality, we carry out a calculation of image anisotropy on each image. The results show that after surgery with intraocular lens implant, a fundus image is usually much brighter, sharp and higher quality. However, this rule of thumb can be altered by several conditions. For example, the multifocal design of the intraocular implant after a clear lens extraction. The anisotropy-based measure has revealed to be a suitable tool to quantitatively assess quality changes between pre-and post-operative fundus images.

Comparison of transverse mode instability in Yb, Tm and Ho doped bent high-power fiber amplifiers

“…Artifact detection in retinal images has been mostly focused on artifacts such as flash flares [14], image quality assessment [15][16][17][18], or as a previous stage for automatic retinopathy screening [19]. However, the detection and removal of dust particle artifacts in retinal images have not been sufficiently studied.…”