Remote measurement of sphero-cylindrical lens power and orientation through distortion analysis

Abstract

A system for measuring the orientation and power of sphero-cylindrical lenses has been developed. The system attempts to minimize the need for specialized equipment and training and instead relies on the ubiquitous cell phone camera, a magnetic stripe card, and a target pattern. By capturing an image of the target through the lenses under test and analyzing the distortion in the resulting image, the orientation and powers on sphero-cylindrical lenses can be determined. In modern eye clinics, the measurement of sphero-cylindrical spectacle lenses is readily measured with a lensmeter. However, there are many examples where this measurement is not feasible. This may include remote or rural locations where access to eye care may not exist, or require impractical travel. Furthermore, the on-going global pandemic has often put restrictions on contact between the patient and the eye care provider. Telemedicine, which can connect patients to eye care providers, lacks physical access to the spectacles for measurement. The system developed in this effort overcomes this limitation by allowing remote measurement of the lenses with items found in most households. Such a system would be beneficial to often underserved populations and expand access to quality eye care. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.