“Electronics Eye” is a new calibration device, invented by Keeler Ltd. It’s used to calibrate a brand new ophthalmic product, the Pulsair Desktop, while in the field. Please refer to the Pulsair Desktop Field Calibration project for further details.
Figure 1 Electronic Eye
The “Electronics Eye” consists of the optical system, a high-precision pressure sensor, a digital signal-processing unit and the embedded intelligent software. The “Electronics Eye” simulates the human eye’s optical properties under the pressure of Pulsair “air puffs” at several reference points across Pulsair Desktop’s Intra-ocular Pressure (IOP) range. This range covers 5 to 50 mmHg.
As the IOP calibrator is used in the calibration of other equipment, the “Electronics Eye” must be calibrated in the factory during manufacturing or servicing and its accuracy must be higher than the instrument (Pulsair Desktop) to be calibrated.
Figure 2 Cailbration Window
The aim of this project was to investigate all the methods available for calibrating the “Electronics Eye”, with a higher level of accuracy, so that it can be used in turn to calibrate the Pulsair Desktop in the field. It also lead to the development of a dedicated device and related software which could be used to calibrate the “Electronics Eye” in the factory.
As a result of this project, a Golden Pulsair Desktop has been set up as an IOP standard and a dedicate software was developed. The Golden Pulsair Desktop is a Pulsair Desktop tonometer. It has been ultra-calibrated using a special method and its effectiveness compared with that of Goldemann Tonometer when tested against the human eye. The dedicated software and the Golden Pulsair Desktop works together to give the highest standard of automatic “Electronics Eye” calibration. The calibration accuracy is ±0.3mmHg and the confidence interval is 0.2 mmHg at 95% confidence level.
Figure 3 Calibration is in progresss