A computer implemented method performed in a system for determining refractive characteristics of an eye, the system comprising an eye visualisation system comprising a display; and the system comprising an analyzer comprising memory and a processor configured to execute optical analytic software and optical ray tracing software; and the method comprising: receiving, by the analyzer, Optical Coherence Tomographic, OCT, image data of an imaged region of the eye; receiving, by the analyzer, refractive mapping data of the imaged region; registering, by the processor, the OCT image data and the refractive mapping data; combining, by the processor, the OCT image data and refractive mapping data; and executing, by the processor, optical ray tracing software to determine the refractive characteristics of the eye based on the combined OCT image data and refractive mapping data; and displaying biometric information indicating the determined refractive characteristics of the eye; wherein the refractive mapping data is received from a refractometer which is configured to operate with a wavelength in the range of 700-900nm, wherein the system comprises a first mirror having a reflectance in the range of 50-100% for a wavelength in the range of 700-900nm, and wherein the first mirror is configured to redirect light into the refractometer; and wherein the OCT image data is received from an OCT imaging system which is configured to operate with a wavelength in the range of 900-1,400nm, wherein the system comprises a second mirror having a reflectance in the range of 50-100% for a wavelength in the range of 900-1,400nm, and wherein the second mirror is configured to redirect light to the OCT imaging system; and wherein the OCT imaging system and the refractometer are integrated via a microscope interface including a beamsplitter, being close to 100% transparent in the range of 400-700nm and close to 100% reflective in the range of 700-1,400nm, to provide an optical coupling into a main optical pathway of the microscope or a slit-lamp. receiving, by the analyzer, Optical Coherence Tomographic, OCT, image data of an imaged region of the eye; receiving, by the analyzer, refractive mapping data of the imaged region; registering, by the processor, the OCT image data and the refractive mapping data; combining, by the processor, the OCT image data and refractive mapping data; and executing, by the processor, optical ray tracing software to determine the refractive characteristics of the eye based on the combined OCT image data and refractive mapping data; and displaying biometric information indicating the determined refractive characteristics of the eye; wherein the refractive mapping data is received from a refractometer which is configured to operate with a wavelength in the range of 700-900nm, wherein the system comprises a first mirror having a reflectance in the range of 50-100% for a wavelength in the range of 700-900nm, and wherein the first mirror is configured to redirect light into the refractometer; and wherein the OCT image data is received from an OCT imaging system which is configured to operate with a wavelength in the range of 900-1,400nm, wherein the system comprises a second mirror having a reflectance in the range of 50-100% for a wavelength in the range of 900-1,400nm, and wherein the second mirror is configured to redirect light to the OCT imaging system; and wherein the OCT imaging system and the refractometer are integrated via a microscope interface including a beamsplitter, being close to 100% transparent in the range of 400-700nm and close to 100% reflective in the range of 700-1,400nm, to provide an optical coupling into a main optical pathway of the microscope or a slit-lamp. <EOS>