2019 Yes https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6328081/#:~:text=An%20increased%20distance%20visual%20task,on%20the%20visual%20acuity%20measure. Negiloni, Kalpa Asia Epidemiology Study Students Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Lighting Test Performance The median distance VA threshold demand was 0.28 logMAR(0.25,0.45). The median illuminance on front desk position and chalkboard contrast was130 lux(92,208) and 40(36,50) respectively with 62% classrooms having low illumination ( <150lux). The acuity reserve evaluated to be included to the distance VA demand was 0.13logMAR and0.29 logMAR in classrooms with optimal and low chalkboard illumination respectively which was based on the results of the simulation experiment.
The median distance VA demand including the acuity reserve was 0.09 logMAR (-0.03,0.23) [Snellen Equivalent: 20/25(20/19,20/34)].