Development of a User interface for an automated aberrometer
| AUTHORS / CAREER / CENTER | Carlos S. Hernandez / Biomedical Engineering / Universidad Carlos III de Madrid |
| SUPERVISOR | Eduardo Lage, PhD, Universidad Autonoma de Madrid |
| TYPE | Bachelor Thesis |
| ABSTRACT | Motivation: A major part of global population suffers poor vision that can be easily corrected with eyeglasses. Uncorrected refractive errors can lead to severe visual impairment and even blindness. The problem is that trained eye care professionals or automated devices that prescribe eyeglasses are not easily available. Problem Statement: The QuickSee is a low-cost aberrometer developed for the purpose of helping people with uncorrected refractive errors in low-resource settings. The objective of this work is to substitute the personal computer in charge of displaying the user interface of a previous prototype and process the data for an embedded system capable of provide the same functionalities. Approach: The embedded system is built using a low-cost single board computer a 2.2” LCD display; 7 buttons; and a power controller circuit. All these limitations in hardware are overcome with the use of an optimized data processing algorithm and a user-friendly interface developed in C++. The software should be able to manage all the functionalities and internal elements of the QuickSee, interact with the user and provide fast and precise eyeglass prescriptions. Results: The system was able to process data in real time while handling the remainder components of the QuickSee. The interface was intuitive, easy to use and responsive even during hard data processing. The system was tested by several subjects validating its good performance. Conclusions: The system exhibits similar performance to the one using the personal computer regarding user interface functionalities. This new device is able to outperform the processing time of the previous prototypes and has a lower material cost and a much smaller size. Key Words: autorefractors, QuickSee, embedded systems, refractive errors, user interface, wavefront aberrometry. |
| LINK | Confidential content |
