area on the display is moved by the touch of a buttonOptional orientation markers (reading line or “blind”)Additional tactile positioning and orientation markers on the housingViewing modes in true colour

eggs. If the body is not supplied with sufficient vitamin A, this can result in dry eyes and night blindness. Everyday burdens such as light, stress and various environmental factors give rise to free radicals

through the use of a vision aid. The visual impairment caused by other sight defects, such as night blindness or amblyopia, cannot be corrected. What is amblyopia? Amblyopia is a vision defect where the visual