CHANGE OF INDICATORS OF VISION FUNCTIONS WHEN USE OF SPECTRAL FILTERS IN CONDITIONS OF USE OF DIGITAL DEVICES

Abstract

In the conditions of the Department of Ophthalmology UMSA, 58 patients (116 eyes) aged 18 to 49 years old were examined, on average 34 0.6 years. At the beginning of the study, 79% of patients with a previous selected optical correction at close range proposed an additional variant of correction with spectral filters of green and light brown. Another 21%, which did not need optical correction at close range, also subjected spectral filters of the corresponding colors. Patients were given a modified ETDRS with standard contrast at close range with optical correction and spectral filters of green and light brown showed a moderate improvement in the clarity and recognition of optocouplers compared with optical correction without spectral filters. When using the modified ETDRS test with a contrast of 20% for Weber and 10% for Michelson at a close distance (33 cm), patients with optical correction and spectral filters of green and light brown color noticed significant improvement in the clarity of the signs compared with the optical viscometer data without spectral filters. After completing work with digital devices, only 24% (14 patients) had a contrast sensitivity of 3, and contrast sensitivity score was good. In 45% (26 patients), contrast sensitivity was 2.5 with an average contrast sensitivity score, and 31% (18 patients) had contrast sensitivity of 2, and contrast sensitivity score was low. When determining the contrast sensitivity using an optical correction with a green spectral filter after completed to work the digital device, 81% (47 patients) had a contrast sensitivity of 3, and contrast sensitivity score was good. In 19% (11 patients) the contrast sensitivity was 2.5, with an average contrast sensitivity estimate. When determining contrast sensitivity using optical correction with a light brown spectral filter after completed to work the digital device, 84% (49 patients) had a contrast sensitivity of 3, and contrast sensitivity score was good. In 16% (9 patients) the contrast sensitivity was 2.5, with an average contrast sensitivity estimate. Also, it was found that in patients without spectral correction of vision, when working with digital devices for 2 hours, the reserve of relative accommodation decreased in 72% (42 patients). Instead, when using the green spectral filter, when working on digital devices, there was an increase in the indicators of reserve of relative accommodation, in patients with hypermetropia and astigmatism, on average, by 1.5 0.02 D and 0.7 0.02 D, respectively, in comparison with similar indicators in their absence. With the use of the spectral filter of light brown color, the reserves of relative accommodation, in patients with hypermetropia and astigmatism, increased by 1.6 0.01 D and 0.8 0.03 D, respectively, in comparison with similar indicators in their absence.

Keywords

• spectral correction
• contrast sensitivity
• accommodation reserves