The influence of the spectral-filter (SF) spectacles (when used for an extended time period--for 4 years), produced on the eye refraction of computer users, was studied. The persons in the main and control groups (mean age was, respectively, 49.46 +/- 2.27 and 46.0 +/- 3.28 years, and mean refraction was, respectively, -0.71 +/- 0.42 and -0.88 +/- 0.5 diopters) used the computers on the daily basis for as long as 4 hours during 4 years. A reliable weakening of refraction in its both variants (i.e. reduction of myopia by 0.16 +/- 0.06 diopters, and an increase of hypermetropia by 0.19 +/- 0.04 diopters) was registered in the main group in case of a prolonged use of the SF spectacles. As for the control group, a reliable increase of myopia by 0.25 +/- 0.06 diopters was noted in operators with myopia, and a reliable weakening of refraction (a growth in the level of hypermetropia) by 27 +/- 0.05 diopters was found in operators with hypermetropia and emmetropia. According to questionnaire results, 88.2% of computer operators, who used the SF spectacles, managed to preserve the initial improvement of comfort, while the comfort degree worsened in 11.8% of them.