{'fraction_non_alphanumeric': 0.02564102564102564, 'fraction_numerical': 0.002564102564102564, 'mean_word_length': 5.791304347826087, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Optical coherence tomography and its application in ophthalmology].

Optical coherence tomography (OCT) is a new imaging modality that provides cross-sectional tomographs of ocular structure in vivo. OCT system utilizes propagation of light through, and the time-of-flight delay of light reflected back from biological tissue to produce false-color images of microstructure. OCT has superior spatial resolution (10 microns) than other optical imaging instruments, and maybe achieved at arbitrary penetration depth in transparent tissue with a noncontact, noninvasive measurement. Such features make OCT useful for the early diagnosis, differential diagnosis and more sensitive monitoring of a variety of ocular abnormalities including glaucoma, retinal and anterior eye diseases.