Research On The Technology Of Laser Interference In Non-Contact IOP Measurement System

Glaucoma is a sort of serious eye disease of high probability of causing blind, which might exists in all ages of people , and its damage can not be cured completely .Early diagnoses is the key to prevent Glaucoma. Main basis of diagnoses of Glaucoma is the pathological high intraocular pressure (IOP). Therefore, whether the results of measurement of IOP can truly reflect the true result of IOP is in direct contact with the level of early diagnoses of Glaucoma. Now, the contact measurements are widely adopted, but these kinds of measurement make the patient uncomfortable and painful. At the same time it can bring infection among the patients. In this paper, we bring forward a new measurement---the non-contact measurement based on the interferential laser. In the new measurement, by using the method of microprocessor controlling linear accelerating movement of stepping motor, pulse airflow is produced to excited comea to vibrate. Then we measure the vibration of comea using the method of spatial laser interferential measurement. The value of intraocular pressure can be extracted by the method of processing the information. Primary experimental results indicate that the project using the method of non-contact intraocular pressure (IOP) measurement based on laser interference to measure should be feasible. In order to convert the experimental intraocular pressure measurement system to a practical product, a laser interferometer of most utility is proposed in this paper. Compared with the experimental device, it is of small volume, compact structure and isolation function, and therefore it is applicable to a practical product. This interferometer differs from any other interferometer, and it is original. By the effort in this paper, stage outcome of research on the technology of non-contact IOP measurement is obtained.