{'fraction_non_alphanumeric': 0.01703800786369594, 'fraction_numerical': 0.0, 'mean_word_length': 5.366666666666666, '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}}
Stains and dyes in Ophthalmology

Stains and dyes are very effective diagnostic and therapeutic tools in ophthalmology. Although non-invasive, diagnostic dyes are objectively used to directly visualize, identify and track microscopic ocular structures for anterior, as also posterior segment disorders. These are very useful, both for anterior and posterior segment disorders. Diagnosis and management of retinal vascular disorders have been revolutionised, ever since the introduction of fluorescein. It is used in an array of disorders of the anterior segment also. The term staining is used to describe epithelial disruption and other pathophysiological changes which can be seen when we use the dyes topically. The dyes used topically are called vital stains.