acuity of 0.1 is sufficient for a person to be able to orientate themselves outdoors. However, a visual acuity of 0.8 is required for reading travel timetables. Other minimum values include: 0.4 for watching [...] watching television, 0.5 for reading the newspaper and 0.7 for reading a telephone directory. Is the ability of the eye to read solely dependent on visual acuity? No. In order to be able to read we require [...] the focal length of a lens measured in metres: a power of +5 dpt therefore has a reciprocal length of 1/5 metres or 20 centimetres. What is long-sightedness? In the case of long-sightedness, the eyeball is
digital magnifier. Product BenefitsRelaxed reading due to non-reflective, high contrast display2 in 1: handy reading device for when you‘re on the move plus simple screen-reading device for use at homeEasy [...] tilted for comfortable viewing angle4 to 12x magnification (hand-held at a distance of 5 cm approx. 1.9- to 4.5x)5 viewing modes: true colour, contrast-enhanced black/white, white/black, black/yellow and [...] Time (Battery)/Battery run time3 hCharging time2 hPower supply charging deviceIn: 100-240VAC 50/60Hz 0.3A max, Out: 5VDC 1500mAOperating temperature10 – 40 °CCharging portMini-USBPort for data transmission
digital magnifier. Product BenefitsRelaxed reading due to non-reflective, high contrast display2 in 1: handy reading device for when you‘re on the move plus simple screen-reading device for use at homeEasy [...] tilted for comfortable viewing angle4 to 12x magnification (hand-held at a distance of 5 cm approx. 1.9- to 4.5x)5 viewing modes: true colour, contrast-enhanced black/white, white/black, black/yellow and [...] Time (Battery)/Battery run time3 hCharging time2 hPower supply charging deviceIn: 100-240VAC 50/60Hz 0.3A max, Out: 5VDC 1500mAOperating temperature10 – 40 °CCharging portMini-USBPort for data transmission