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Spectacles & Contact Lenses Two pairs of spectacles, 1800-1850

Spectacles & Contact Lenses Two pairs of spectacles, 1800-1850
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Largest available format 3504 × 2802 px 2 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 2802 px 297 × 237 mm 1.5 MB
Medium 1024 × 819 px 87 × 69 mm 685 KB

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IMAGE number
UIS5081072
Image title
Spectacles & Contact Lenses Two pairs of spectacles, 1800-1850
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
object
Image description

Spectacles & Contact Lenses Two pairs of spectacles, 1800-1850. The pair of spectacles shown to the left have sliding steel frames with small loops for a riband to pass behind the head. The pair on the right have silver frames with turnpin sides, and are dated c 1850. Spectacles have been in use in the West for at least 700 years. The earliest had convex lenses, and were designed to beworn 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
Image keywords
vision

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