[The expression of the correction of corneal astigmatism in the point spread function analysis system of human eyes].

Objective: To investigate the ocular optical imaging quality among corneal astigmatism subjects under different corrections by using the Point Spread Function analysis system (PSF).

Methods: PSF 1000 analyzer was used to measure retinal image quality of eyes of 26 subjects with corneal astigmatism (sphere ranged from -3.00 to -6.

[Selection of Chinese visual targets by fourier frequency spectrum analysis].

Objective: To select Chinese characters for Chinese visual acuity chart by using the method of Fourier frequency spectrum analysis.

Methods: BMP images were made for 1062 Chinese characters with small or medium number of strokes. The images were processed to derive frequency spectrum at the frequency domain by using a MatLab program.

[To pay attention to the research and clinic application of the visual quality].

Superior visual quality not only means normal visual acuity, also includes normal contrast sensitivity, color vision, visual field and binocular vision. The concept of wave-front aberration and its correction technique have been introduced into the ophthalmology in China, and play an important role in finding and resolving the problems related to the visual quality. However, the concept and knowledge of the wave-front aberration does not get popularization in Chinese ophthalmologists.