Abstract
Purpose :
We developed a new super-retinal imaging display (SRID) based on scanning laser ophthalmoscopy (SLO) technology that can project Landolt ring images onto the retina. Using this device, the fundus visual acuity (FVA) can be estimated without refractive error correction. We studied the clinical usefulness of the FVA using the SRID.
Methods :
Seventeen eye of 17 healthy subjects (10 men, 7 women; mean age ± standard deviation [SD], 31.1 ± 9.2 years) and seven eyes of 7 patients (4 men, 3 women; mean age ± SD, 66.9 ± 7.6 years) were included in this study. Eyes with myopia exceeding -6 diopters (D) and with astigmatism more than 2.0D were excluded. For healthy subjects, the uncorrected VA (UCVA) and the best-corrected VA (BCVA) up to 1.0 were examined, as the maximal value estimated by the SRID was 1.0. The FVA was estimated by the average result of three examinations. The UCVA, the BCVA and the FVA were compared. For the diabetic patients, the FVA was estimated by the average result of 2 examinations. The correlation between the FVA and the BCVA was studied. For statistical analyses, the VA values were converted to the logarithm of the minimum angle of resolution values.
Results :
In eyes of healthy subjects, the BCVAs of all subjects were 0.00. The FVA (average ± SD, 0.00 ± 0.00) was significantly (p<0.01) better than the UCVA (0.62 ± 0.50) and did not differ significantly (p>0.05) from the BCVA. The examination time for the FVA was less than one minutes (average ± SD, 56.8 ± 21.1 seconds). In eyes with impaired visual acuity, a significant positive correlation (r = 0.96, P < 0.01) was observed between the BCVA and the FVA.
Conclusions :
The fundus visual acuities estimated by the super-retinal imaging display would be clinically useful, as it would be almost equivalent to the best-corrected visual acuity up to 1.0, and it can be examined without patient’s choice of the lens for the refractive error correction in a short time.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.