Concept:Some persons, including children, can be visually impaired.They have very limited vision to see thingsSuch persons try to identify things by touching and listening to voices more carefully.They develop their other senses more sharplyAdditional resources can enable them to develop their capabilities furtherExplanation:The most popular resource for visually challenged persons is the Braille scriptIt was developed by Louis Braille in 1821The Braille system has 63 dot patterns or characters.Each character represents a letter, a combination of letters, a common word or a grammatical sign.Dots are arranged in cells of two vertical rows of three dots eachThus, this script is based on six pointsThese patterns when embossed on Braille sheets(thick paper) help visually challenged persons to recognise words by touching.To make them easier to touch, the dots are raised slightlyThis script can be typed or manually made using pointed toolsThis script is based on 6 points.