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Tsutomu Shimizu, Sachiko Masui, Megumi Saiki, Hidemasa Torii, Murat Dogru, Kazuo Tsubota, Kazuno Negishi, ; The Relation Between Functional Visual Acuity and Functional Visual Field for Elderly Drivers with Normal Cognitive Status.. Invest. Ophthalmol. Vis. Sci. 2014;55(13):6116.
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© ARVO (1962-2015); The Authors (2016-present)
To investigate the relationship among functional visual field, functional visual acuity, and the score of Schirmer test in elderly drivers with normal cognitive status.
Thirty eyes of 30 healthy adult volunteers (22 males and 8 females), who had no ophthalmic diseases other than refractive errors, had a normal cognitive status (23 and more with mini-mental state examination-Japanese (MMSE-J)), and drove at least once a week, were enrolled in this study. All subjects underwent slit-lamp microscopy, binocular corrected distant visual acuity (CDVA), binocular distant functional visual acuity (FVA) using the FVA measurement device Kowa AS-28 (Kowa Co Ltd, Aichi, Japan), tear break up time (BUT), Schirmer test without topical anesthesia, and functional visual field using Visual Field with Inhibitory Tasks (VFIT). VFIT is a computer software developed in 2004 to detect functional visual field for healthy subjects and cerebral injury patients. This test measures a person’s ability to recognize one object in the peripheral visual field while watching a point of regard at the center of the screen. The percentage of correct answers in VFIT is already known to have a significant correlation with the rating of driving skills using an actual vehicle (Fujita.Y et. al. Sagyoryohou [in Japanese], 2012). Spearman’s rank correlation coefficient was used to investigate the relationship between the percentage of correct answer of VFIT, CDVA and FVA.
The mean age of the subjects was 66.8±4.4 years ( range: 60 to 77 years). Mean CDVA and FVA in log MAR were -0.11±0.12and -0.03±0.14, respectively. The mean percentage of correct answers in VFIT was 86.6±11.3. The mean score of Schirmer test was 8.0±6.3 mm. The mean BUT was 3.4±2.8 seconds. The percentage of correct answers in VFIT significantly correlated with FVA (r = -0.470 and P = 0.009), but not with CDVA.
FVA has the potential to effectively evaluate the elderly driving skills.
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