greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

their size is always five times the thickness of the line, and in the case of the Landolt ring, the gap width is also the same as the thickness of the line. During the sight test, if the person who is being [...] being tested can recognise a test symbol that has a line width of less than 1 minute of arc, then their visual acuity will be 1. If the person being tested has a visual acuity of only 0.5, then the test symbol

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,

greater than 58 mm (Item No. 15539-, 15549-, 15599-) are fitted with a retractable red reading line for easier line orientation and increased reading speed.The rectangular magnifier heads (Item No. 15806-,