Since 1982,  over 170,000 units of the LANG-STEREOTEST^® I/II have been sold worldwide. The test has been most widely used in Germany, France, Italy, England, the USA and Japan. Regular users include ophthalmologists and paediatricians as well as specialist opticians and optometrists, school doctors and general practitioners.

In many countries, the test is considered a standard screening tool in state compulsory series examinations such as of school children, in a wide variety of occupational aptitude tests such as of pilot candidates or crane drivers and in driving licence examinations.

In 2018, the new LANG-STEREOPAD^® for determining the stereo vision threshold was launched. The newly developed and improved version LANG-STEREOTEST^® I-R followed in 2021 and the new version LANG-STEREOTEST^® II-R in 2023.

Lang-Stereotest AG aims to improve the lives of children by diagnosing visual defects at an early stage. Our test helps professionals and authorities to prevent amblyopia or to diagnose it as early as possible. Every child is at risk from birth of developing unnoticed amblyopia, which remains irreversible after a certain period of time. Systematic and repeated screening of stereo vision from the second year of life can reduce this risk and enable timely treatment.

The Swiss strabologist and company founder Prof. Dr. med. Joseph Lang made a pioneering contribution to the early detection and successful treatment of amblyopia with his initial description of microstrabismus and its significance for the development of strabismus. The Lang-Stereotest^® invented by him has been the most frequently used spectacle-free stereotest for over 40 years and has been constantly developed further ever since.

We are committed to furthering this achievement and increasing the spread of stereopsis screening worldwide with our testing procedures. As a family-run Swiss company, we are proud to maintain and expand our position in the world market.