| Popis: |
A system for measurement to obtain Neural Contrast Sensitivity Function(NCSF) is constructed,according to the relationship between Modulation Transfer Function(MTF)calculated from wave-front date and Contrast Sensitivity Function(CSF) with a wide range of spatial frequencies.Compared with previous measurement method,the coherent noise and speckle noise can be avoided using the proposed method which are brought in by the interference of laser beams,and white-light NCSF can also be provieded.The green-light and white-light NCSF are acquired with this technique for different eyes.It is shown that NCSF,which is independent of the optical system of eye,for green-light is higher than that for white-light under the condition of the same luminance.The maximum value of CSF appears at 8 c/deg of the green-light and white-light,while the maximum value of NCSF of the green-light and white-light appears at a higher spatial frequency of 12 c/deg. |
