Free Eye Exam Practice Game 'Henshin! Ninjakushi™' Released to Detect 'Hidden Amblyopia' in Children

Quaras Inc. (Shinagawa, Tokyo; CEO: Yukio Matsushita) has released 'Henshin! Ninjakushi™ (ver.β)' on June 10, 2026. Developed in collaboration with Professor Tomoya Handa of Kitasato University, this free game provides a fun experience for children to familiarize themselves with vision screening.

The project aims to reduce the burden of home eye exams and facilitate the early detection of 'hidden amblyopia,' which is often difficult for both children and parents to notice. This is the first initiative from 'Human Interface Lab [HINT],' an industry-academia partnership between Quaras and Kitasato University.

### Key Highlights - **Launch on Children's Eye Day:** A free game designed for early amblyopia detection. - **Home-based Experience:** Children learn the Landolt C-ring and picture-based eye tests through play. - **Collaboration:** The first project of the 'HINT' initiative between Quaras and Kitasato University.

### Background Vision issues in children often go unnoticed until formal checkups, such as the 3-year-old health exam. However, conducting tests at home is challenging due to short attention spans. This game uses a story about a 'ninja tadpole' that transforms into various objects, allowing kids to learn the testing methods naturally. The browser-based game requires no installation and is compatible with PCs, smartphones, and tablets.