A NEW PARAMETER FOR THE ASSESSMENT OF DISTANCE VISUAL CAPACITY: THE CRITICAL VISUAL ACUITY (CVA)

Published 2023 - 27th ESCRS Winter Meeting

Reference: O87 | Type: Free Paper Submission | DOI: 10.82333/993j-8154

Authors: Georgios Labiris* ¹ , Minas Bakirtzis ¹ , Eirini-Kanella Panagiotopoulou ¹ , Konstantinos Delibasis ² , Christos Panagis ¹ , Christina Mitsi ¹ , Panagiota Ntonti ¹

¹Department of Ophthalmology,University Hospital of Alexandroupolis,Alexandroupolis,Greece, ²Computer Science and Biomedical Informatics,University of Thessaly,Lamia,Greece

Purpose

To develop and validate a new clinical parameter for the assessment of distance visual capacity taking into account reading speed: the Critical Visual Acuity (CVA).

Setting

Department of Ophthalmology, University Hospital of Alexandroupolis, Alexandroupolis, Greece.

Methods

Participants populated two study groups: Control Group (CG) and Patients Group (PG). For all participants monocular and binocular best spectacle -corrected distance visual acuity (VA) and critical visual acuity (CVA) at 300 cm was measured using Democritus Digital Acuity & Reading Test (DDART) web-based digital chart. Furthermore, subjective evaluation of visual capacity was performed through NEI-VFQ-25 score. Receiver operating characteristic (ROC) curve analysis was used to evaluate the CVA’s diagnostic ability. According to NEI-VFQ-25 score participants were classificated into impaired and non-impaired visual capacity subjects.

Results

370 participants were recruited. The diagnostic ability of CVA in comparison with VA was evaluated using receiver operating characteristic (ROC) curve analysis. The CVA’s area under the ROC curve (AUROC) was significantly higher than the VA’s AUROC. CVA’s sensitivity and specificity values was also significantly higher than the corresponding values of VA.

Conclusion

The assessment of visual capacity is a really complicated procedure. The existing clinical parameter (VA) does not take into consideration important clinical factors, such as reading speed. CVA is a new clinical parameter that evaluates more accurately the visual capacity in comparison with VA.