Abstract
Purpose. The German regulation on granting persons permission to drive on the road specifies minimum visual requirements for obtaining a driving licence. The aim of this pilot study was to determine orthokeratology-related diurnal
variations in visual acuity, contrast vision and twilight vision, as well as glare sensitivity, and to verify compliance with the requirements for obtaining a driving licence.
Material and Methods. Ten orthokeratology lens wearers (26.0 ± 7.1 years) with myopia of −2.43 ± 0.97 D and astigmatism of −0.31 ± 0.41 D were tested twice daily (08:30 a.m. and 20:30 p.m.) with the Binoptometer 4P (Oculus, Wetzlar,
Germany). Monocular and binocular visual acuity were tested according to the ISO 8596 and compared with the visual acuity requirements for obtaining a driving licence. In addition, binocular contrast and twilight vision as well as glare
sensitivity were tested in both exams. Differences between the morning and evening examinations were determined using the paired t-test or the Wilcoxon signed-rank test (for non-normally distributed data).
Results. There was no statistically significant difference between monocular visual acuity (logMAR) in the morning (right −0.07 ± 0.16; left −0.03 ± 0.15) and evening (right −0.09 ± 0.14; left −0.06 ± 0.17) (p = 0.875; p = 0.353) or binocular visual acuity in the morning (−0.11 ± 0.15) and evening (−0.13 ± 0.13) (p = 0.500). Decimal visual acuity ranged monocularly from 0.63 to 2.00 and binocularly from 0.70 to 2.00. This corresponds to the threshold value of an ophthalmological assessment for visual acuity of the better eye or for a binocular visual acuity of 0.5. There was no statistically significant difference between the quality of contrast vision in the morning (mean Weber contrast 11.5 ± 3.4 %) and in the evening (15.5 ± 9.3 %) (p = 0.070), and twilight vision and glare sensitivity in the morning (both 0.27 ± 0.09 logCS) and in the evening (both 0.27 ± 0.09 logCS) (p = 1.000).
Conclusion. Visual acuity, contrast sensitivity, twilight vision and glare sensitivity to glare were stable throughout the day in this sample for orthokeratology lens wearers. The requirements of the eye test needed to drive were fulfilled by all but one of the participants in the standard eye test, both in the morning and evening examinations. A more comprehensive eye test was also carried out. This was passed by all test subjects, both in the morning and evening examinations.
variations in visual acuity, contrast vision and twilight vision, as well as glare sensitivity, and to verify compliance with the requirements for obtaining a driving licence.
Material and Methods. Ten orthokeratology lens wearers (26.0 ± 7.1 years) with myopia of −2.43 ± 0.97 D and astigmatism of −0.31 ± 0.41 D were tested twice daily (08:30 a.m. and 20:30 p.m.) with the Binoptometer 4P (Oculus, Wetzlar,
Germany). Monocular and binocular visual acuity were tested according to the ISO 8596 and compared with the visual acuity requirements for obtaining a driving licence. In addition, binocular contrast and twilight vision as well as glare
sensitivity were tested in both exams. Differences between the morning and evening examinations were determined using the paired t-test or the Wilcoxon signed-rank test (for non-normally distributed data).
Results. There was no statistically significant difference between monocular visual acuity (logMAR) in the morning (right −0.07 ± 0.16; left −0.03 ± 0.15) and evening (right −0.09 ± 0.14; left −0.06 ± 0.17) (p = 0.875; p = 0.353) or binocular visual acuity in the morning (−0.11 ± 0.15) and evening (−0.13 ± 0.13) (p = 0.500). Decimal visual acuity ranged monocularly from 0.63 to 2.00 and binocularly from 0.70 to 2.00. This corresponds to the threshold value of an ophthalmological assessment for visual acuity of the better eye or for a binocular visual acuity of 0.5. There was no statistically significant difference between the quality of contrast vision in the morning (mean Weber contrast 11.5 ± 3.4 %) and in the evening (15.5 ± 9.3 %) (p = 0.070), and twilight vision and glare sensitivity in the morning (both 0.27 ± 0.09 logCS) and in the evening (both 0.27 ± 0.09 logCS) (p = 1.000).
Conclusion. Visual acuity, contrast sensitivity, twilight vision and glare sensitivity to glare were stable throughout the day in this sample for orthokeratology lens wearers. The requirements of the eye test needed to drive were fulfilled by all but one of the participants in the standard eye test, both in the morning and evening examinations. A more comprehensive eye test was also carried out. This was passed by all test subjects, both in the morning and evening examinations.
| Translated title of the contribution | Orthokeratology in road traffic – a pilot study |
|---|---|
| Original language | German |
| Pages (from-to) | 334-340 |
| Number of pages | 7 |
| Journal | Optometry & Contact Lenses |
| Early online date | 30 Oct 2023 |
| DOIs | |
| Publication status | E-pub ahead of print - 30 Oct 2023 |