1. 20-30-50: Outdoor activities and workplaces. Such as corridors, storage rooms, staircases, bathrooms, cafes, Pre-Station advertising and so on.

2. 30-100-150: Location of circulation place and direction of short journey. Such as elevator front room, room service room, bar counter, indoor restaurant business hall, duty room, post and telecommunications, entertainment hall, theatre, entrance hall, inquiry office, consultation room, shopping mall lead area and so on.

3. 100-150-200: Non-continuous use of the workplace. Office, reception room, guest room desk, store shelf, counter, snack bar, kitchen, box office, rehearsal hall, ticket office, operating room, radiology room, radio room, switchboard room, electric classroom, bowling, hairdressing room and so on.

4. 200-300-500: Simple visual requirements of the workplace. Such as reading room, design room, typing room, window, showroom, beauty, cooking, sports training ground, glass and stone metal exhibition hall, bowling, volleyball, badminton, martial arts and other venues.

5. 300-500-700: The workplaces with medium visual requirements. Gymnastics, tennis, swimming, diving, drawing room, printing room, wood machinery processing, general fine work, rough processing, machine tool area, electrical repair workshop and so on.

6. 500-750-1000: Operations with strong visual requirements. Table tennis, Go, chess, etc. competition venues, metal processing plants, electromechanical assembly workshop, precision repair workshop, typing room, polishing workshop and so on.

7. 750-1000-1500: Places where visual work is difficult.

8. 1000-1500-2000: Workplace with special visual requirements.

More than 9,2000: Very precise visual operation.