A simple device made using origami. Using our data-driven approach, we have calibrated this device on the most commonly observed refractive error ranges. Easy to understand, intuitive to use. 


Usable by all

The lenses need to be placed in their designated positions and fold along the lines. The two parts line up inside one another, resembling a telescope. The patient needs to look through the device a fixed distance away from the designated target, and move the outer chamber inwards until the image just comes into focus.






reliable predictions of refractive error

We collected data from 100 subjects and measured their refractive error using our device, subjective refraction and objective refraction at the clinic. The adjoining plot shows the comparison between our device's readings and the gold standard (taken as ground truth). Patient data is represented by opaque dots (darker color indicates overlapping of multiple samples with the same measurements). The line of best fit and the standard error of the mean are represented by the blue line and gray shade, respectively. There is a strong correlation between JULIA readings and standard readings (Pearson correlation: rho = 0.8, p < 1e-16). 

easy to assemble

Our device is extremely easy to assemble, it can be put together in a matter of minutes without prior training. Simple origami is needed, similar to folding a takeaway parcel box or an envelope.

A low cost innovative vision screening device from the Srujana Center for Innovation at LVPEI.

The Team

Ashish Jain : Project Lead and Product Designer

Sandeep Vempati: Project Engineer, Optics. 

Dr Pavan Velkicharla: Validation Scientist

Aadya Krishnaprasad: Visual Designer( Colour version of Folding Foropter) 

Raghu Gullapalli : Project Coordinator

Dr Anthony Vipin Das: Project Coordinator

Dr Virender Sangwan: Motivator


People who were previously involved with the project: 

Dhruv Joshi: Technical coordinator (came up with the idea of making device paper based and coordinated the project)

Abhishek Baronia: Designer ( involved in designing the first versions of paper device) 

Veerendranath Pelsala: Former Optometrist at LVPEI, first to come up with the idea and conceptualize into a product. 

Amir Ali: Optometry Intern (Data collection) 

Ang Cui: Data Analyst from MIT