Q: How do movies create the illusion of movement?
A: By showing still images at a rate faster than 16 per second (typically 24 pictures per second), creating the perception of continuous motion.
Q: What is the Braille system?
A: A tactile reading and writing system for visually impaired people, using raised dot patterns that can be read by touch.
Q: How can one take care of their eyes?
A:
Avoid too little or too much light
Do not rub eyes
Wash eyes with clean water if dust enters
Read at a normal distance
Eat foods rich in vitamin A
Q: What is the most comfortable reading distance for a normal eye?
A: Approximately 25 cm.
Q: What is a cataract?
A: A condition where the eye lens becomes cloudy, typically in old age, causing foggy vision that can be treated by replacing the lens.
Q: How do animals’ eyes differ from human eyes?
A: Different animals have unique eye adaptations. For example, owls have more rods for night vision, while day birds have more cones for daytime vision.
Q: What gives the eye its distinctive color?
A: The iris gives the eye its color.
Q: How does the iris control light entering the eye?
A: The iris controls the size of the pupil, which expands in dim light to let more light in and contracts in bright light to reduce light entering the eye.
Q: What are some non-optical aids for visually impaired persons?
A: Tactual aids (like Braille), auditory aids (talking books, tape recorders), and electronic aids (talking calculators, computers).
