# Use of the perceptual point-spread function to assess dysphotopsias

## TL;DR

This paper introduces a new method to objectively measure dysphotopsias like halo and glare in patients with cataract surgery implants.

## Contribution

A novel perimetry method and custom device for quantifying dysphotopsias in the far-field region.

## Key findings

- A custom device was built and tested on patients with mild cataracts or IOLs.
- The method enables quantitative assessment of dysphotopsias in the central visual field.
- The approach could lead to objective comparisons of dysphotopsias in clinical settings.

## Abstract

Nowadays many patients are choosing EDOF or multifocal lenses for replacement of natural lens in cataract surgery. This can result in issues such as presence of dysphotopsias, namely halo and glare. In this work, we propose a new perimetry method to describe dysphotopsias in far-field region in a presence of bright, point-like light source. We constructed a custom device and designed measurement procedure for quantitative measurement of dysphotopias in the center of visual field and used it to examine patients with mild cataracts or implanted IOLs. Our approach may help in establishing an objective method to study and compare dysphotopsias.