9820
For people with presbyopia and hyperopia , bifocal and trifocal glasses provide two or three different refractive indices , respectively , and progressive lenses have a continuous gradient .
 disease: presbyopia
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 disease: presbyopia