Question: who created the first seamless bifocal a precursor to all progressive lenses
[{'answer': 'Irving Rips', 'provenance': [{'wikipedia_id': '150423', 'title': 'Bifocals', 'start_paragraph_id': 6, 'start_character': 9, 'end_paragraph_id': 6, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '150423', 'title': 'Bifocals', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 127, 'bleu_score': 0.9021315316859231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13327047008586885148}, 'section': 'Section::::History.\n'}]}]