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Optician John Dollond ( 1706 – 1761 ) tried to correct for this distortion by combining two separate lenses , but it was still difficult to achieve good resolution for far distant light sources .
 person: John Dollond
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:
 person: John Dollond