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Spectacles & Contact Lenses Multiplying spectacles, 1650

Spectacles & Contact Lenses Multiplying spectacles, 1650
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Not available to clients invoiced in the UK
Largest available format 3504 × 2738 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 2738 px 297 × 232 mm 913 KB
Medium 1024 × 800 px 87 × 68 mm 639 KB

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IMAGE number
UIS5081433
Image title
Spectacles & Contact Lenses Multiplying spectacles, 1650
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
object
Image description

Spectacles & Contact Lenses Multiplying spectacles, 1650. Multiplying spectacles comprising a pair of rock crystal 'lenses', each with 24 facets, in a gilt metal frame. Spectacles have been in use in the West for at least 700 years. The earliest had convex lenses, and were designed to be worn by people with long sight, to help them focus on nearby objects. Later, concave spectacle lenses were made for people with short sight. In 1784 Benjamin Franklin (1706-1790) invented 'bifocals' - spectacles split into two parts, each with a different focal length. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
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vision

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