India News

A team from IIT Delhi helps blind students to ‘see’ diagrams

We all believe in education for all, but even today, visually impaired students are not getting the education they really deserve. There are subjects like learning science, technology, engineering, and mathematics (STEM) and biology, which are based on diagrams, drawings or graphs. But blind students often have to forego these subjects because of the challenge involved in learning these concepts and processes without the ability to see.

Yes, there is braille in India that is made available to help visually impaired students understand written text. The braille is a typical textbook consists of only text without any pictures and diagrams. As a result, blind students are obligated to study subjects that are theory-based, “thus almost completely eliminating opportunities for them in most of the new age jobs,” says Piyush Channana, a PhD student at IIT Delhi.

To help such students to see diagrams, a 36-year-old Piyush and his team  developed a technology that uses 3D printing to produce high-quality, affordable tactile diagrams on a large scale for books and other printables in Braille.

Tactile diagrams are images that consist of raised lines and textures that can be used by the visually impaired to understand the graphical information using their sense of touch. The technology helps creates moulds and allows thermoforming, which is needed to produce these tactile diagrams.

This team set up the Raised Lines foundation (RLF), a social welfare company, at IIT Delhi in July 2018, in order to help such students to study science and allied subjects.

While the concept of tactile diagrams has been around for a while abroad, RLF is working with the Indian education system to incorporate simplified tactile diagrams in textbooks for the visually impaired. If successful, it could open up vast areas of education that have been off limits to blind students.

Beginning at IIT Delhi

RLF is a spin-off of Assistech Labs, an interdisciplinary group of faculty, research staff, and students at IIT Delhi. The team uses technology to find affordable solutions for the visually impaired. Sometime in 2013, the group developed the SmartCane, an aid to help the visually impaired move around independently and safely.

Ironically, the biggest problem it faced was trying to explain how the SmartCane worked to those who were supposed to use it. First, the team thought that if there was a diagram, they would be able to understand it. But how do you draw a diagram that could not be seen? It had to be felt, that is, it had to be tactile. The first tactile diagram they created was made of lentils!

(L) A tactile diagram to help explain how the Smartcane works. (R)  The first attempt at creating the tactile diagram using pulses and thread.

The next step was to put the diagram into the SmartCane manual. But since the first diagram was handmade, the challenge was to create it at scale. And so the research continued. That’s when they realised that the problem of representing a visual to the visually impaired ran much deeper.

“We realised that blind students were leaving subjects like science and mathematics after school because the Braille books come without diagrams, and everything is dependent on the effort of the teacher,” Piyush explains.

How do tactile diagrams help?

Pictures and graphics play a critical role in education right from the beginning. “Alphabets are taught through picture books where the sounds associated with the pictures (e.g. A for Apple with a picture of an apple) reinforce the learning. Similarly, numbers are introduced using picture books where a number of different common items is shown to reinforce counting (e.g. three is shown with a picture of three balls),” says Piyush.

As we progress in school, the role of graphics becomes more important. “Chemical structures and equations, mathematical (geometry graphs, charts) diagrams, illustrations of physical processes as well as parts of plants and animals, structure, concepts of physics, and geographical maps, etc. are almost always taught to sighted children using pictures and graphics,” he adds.

“This is essentially why RLF was incubated at IIT Delhi. The goal is to provide textbooks in an accessible format along with the tactile diagrams to every student with visual impairment and empower them to choose subjects by choice and not compulsion.”

This inspired the team at IIT Delhi to do this on a bigger scale and solve the problem. Initially, the team worked closely with blind people, organisations for visually impaired, special teachers, and several other stakeholders to come out with an easy, scalable, and automated solution.

The team also had multiple versions with different kind of sheets and tools, but the best results were produced by 3D printers, which would print customised diagrams for visually impaired persons, says Piyush.

“In just six months of its launch, the 12-member team at RLF has made this solution scalable and produced 2,000 tactile supplement books. It can also produce about 500 books per month in-house.”

It has produced more than 70,000 tactile copies of 1,000 unique diagrams in maths, science, geography, and economics books for Classes six to 12. RFL has also created manuals on menstrual hygiene management and has added diagrams in the book, ‘Yogikasparsh – Resource for Teaching Yoga Asanas’ for yoga postures.

The company has also started receiving independent orders like sitemaps from art galleries, and for training manuals, etc. through its website, apart from direct orders from organisations. “Our focus now is on the market penetration, business development, and diversification,” says Piyush. Training manuals for computers, smartphones, musical instruments, building layouts, and floor plans are all in the works.

A team that set up the Raised Lines Foundation at IIT Delhi.

RLF has received support from bodies like NCERT, state education boards, the Sarva Shiksha Abhiyan (MHRD), WSSCC (Water Supply and Sanitation Collaborative Council), and other organisations working for blind people. While this may sound impressive, it is just the beginning. To fulfill this vast need for textbooks, RFL needs to scale up at a very high pace.

“Being a not-for-profit, we are looking at a mix of public financing and CSR funding to support us in producing and disseminating these books,” says Piyush.

The next chapter

In the next three years, RFL aims to reach more than 200 organisations working for the blind, including schools and training institutions, and deliver more than 25,000 tactile books across the country. Besides designing 50+ books, including textbooks in multiple languages, training modules, and other books, it also wants to supply the books to clients outside India.


About the author

Divya Sagar

Divya Sagar

Divya Sagar is Content Editor at CNT Expositions and Services and manages the content of its online website, Indian 3D Printing Network. With a longstanding commitment to the site's content, she is credited with tracking and publishing news related to 3D Printing Industry. She also tracks market trends, key developments and the latest 3D printing research.