Near and intermediate visual acuity: chart vs digital – the first step towards quality of vision evaluation techniques

Session Details

Session Title: Quality of Vision Evaluation

Session Date/Time: Tuesday 17/09/2019 | 16:30-18:00

Paper Time: 16:36

Venue: Free Paper Forum: Podium 4

First Author: : N.Hauranieh ITALY

Co Author(s): :    P. Giardini                             

Abstract Details

Purpose:

High technology for diagnosis, surgery and Premium IOLs have all the same final target to achieve good visual quality performance of our patients; Measuring Visual acuity is the first step to quantify Visual Quality, a set of measure to achieve visual performance. Patients need to performe well using smartphones, tablets and computers. This study is to validate a system that can quantify visual acuity specially for digital purpose. We compared two methods to measure near and intermediate visual acuity, traditional chart and Digital chart using a high definition monitor, to demonstrate that both systems had a good level of agreement.

Setting:

Polivisus Microsurgery Clinic - Brescia (IT)

Methods:

ETDRS Chart for near and intermediate Vs Digital system chart constructed with the same ETDRS chart characteristics were used. A group of 200 patients: Mean age equal to 51 ± 14 years (57% female 49 ± 15 years, and 43% male 54 ± 13 years). We analyzed near and intermediate visual acuity in both eyes. Besides, analyzing our sample with reference to kind of ametropia, we noted it was composed by 18.26% of eyes with presbyopia, 13.91% with myopia, 13.04% with hyperopia combined with presbyopia and an identical percentage of eyes with astigmatism combined with myopia and presbyopia

Results:

Statistical analysis gave a good level of agreement between the two measurements as emerge from Bland-Altman plot: 88% of observations were included in the limits of agreement (95%CI: -0.18 – 0.10 logMAR). Lin’s concordance correlation coefficient 0.73 (95%CI: 0.65-0.80), and ICC mixed equal to 0.78 (95%CI: 0.70-0.84). There was a mean value of difference between Chart and Digital. Digital does not substitute Charts but gives a new number for digital acuity for near and intermediate. Digital database in the digital Chart gave the possibility to follow-up patients and also to compare results between Premium IOLs.

Conclusions:

The study demonstrated agreement between Digital chart and ETDRS chart. The digital system used is a quality of vision evaluation system that considers other measurements but it still fundamental to have a correct near and intermediate visual acuity measurement first. It helps clinicians in their research to better manage vision quality performance, allowing the use of more statistical methodologies for its validation and reliability. The present Digital system measurements can be used for scientific observations to reach a perfect interchangeability, Chart and digital. Normative database gives the opportunity to follow up patients and customize surgical treatments and patient’s needs.

Financial Disclosure:

None