Corneal Contact Lens Mailer Case with Lens
 Catalogue Number: 3860 Corneal Contact Lens Mailer Case with Lens Category: Spectacles and lenses Sub-Category: Contact lenses and accessories Year Of Publication/Manufacture: 1960s Time Period: 1940 to 1999 Description Of Item: White plastic rectangular contact lens mailing case 45 mm x 28 mm x 5 mm with label affixed to underside bearing 14.0 7.8 imprinted and -4.00 LM 38 #23 handwritten containing clear lens overall diameter 10 mm which is in fact a dehydrated hydrophilic lens with overall diameter 14 mm. Temporary storage Box A Historical Significance: Hydrophilic lenses were manufactured from buttons of polyhema material and hydrated to produce the finished lens. In the early days of soft lenses each batch of material could have a different expansion coefficient and this had to be considered in calculating the dry parameters of the lens to achieve the required final result How Acquired: Donated by Ian Bailey Date Acquired: 14/10/2019 Condition: Good Location: Archive Room. East wall Unit 5 Cupboard |