Study, Based On The Technology Of Measuring Eye Partially Coherent Interface Thickness

Intraocular distances (IODs) include corneal thickness, anterior chamber depth, lens thickness, retinal thickness and axial eye length. The precise knowledge of them is important in many fields of modern ophthalmology. Measurements of IODs are currently performed with instruments based on the ultrasound (US) technique, optical slit-lamp technique and so on. Although they have some advantages in measurements of IODs, they also have some disadvantages. Therefore, a new measurement which can be used to overcome their disadvantages is needed.The method on basis of the partial coherence interferometry (PCI) and the laser Doppler principle introduced in this thesis is a dynamic approach. No contact between the eye and the sensor is needed and the necessity to anesthetize the cornea is avoided. Thus, the patient is more comfortable. In addition, high resolution, high accuracy and high repeatability are achieved. In this thesis, the main principle and method of measurement of IODs by PCI is introduced; the choices of light source including spectrum character and laser safety regulations are considered; dispersion compensation technique and the wavefront matching technique are discussed. Finally, the experiment of PCI is done to prove that the principle of measurement of IODs by PCI is feasible. Finally, the accuracy of measurement is discussed by measurement of the optical length of plane parallel glass plates of known thickness and group refractive index.