{"product_id":"instrument-optique-ancien-de-test-visuel-stenope","title":"An old optical instrument for visual testing (pinhole camera)","description":"\u003cp data-start=\"91\" data-end=\"891\"\u003eAn antique optical instrument for eye examinations, preserved in its rigid black-covered case with a molded brown velvet interior. The set includes a circular screen with a small central aperture (pinhole) mounted on a detachable handle, and a lens. The pinhole allowed for testing visual acuity by reducing optical aberrations, a classic method used by ophthalmologists and opticians to distinguish refractive errors from other eye conditions. The separate lens, marked \"13,\" is likely a test lens used during the examination. This type of small, portable instrument was commonly used in opticians' and ophthalmologists' offices during the first half of the 20th century.\u003c\/p\u003e\n\n\u003cp data-start=\"893\" data-end=\"1171\"\u003e ✦ Origin: Europe\u003cbr data-start=\"914\" data-end=\"917\"\u003e ✦ Estimated period: Circa 1930\u003cbr data-start=\"946\" data-end=\"949\"\u003e ✦ Dimensions: box approx. 14 x 6.5 x 2 cm\u003cbr data-start=\"992\" data-end=\"995\"\u003e ✦ Material: metal, optical glass, leather-wrapped case \u003cbr data-start=\"1042\" data-end=\"1045\"\u003e✦ Condition: Good overall condition; signs of wear in the interior velvet and slight marks on the case, lenses in good condition\u003c\/p\u003e\n\n\u003cp data-start=\"1173\" data-end=\"1350\"\u003e An old scientific instrument related to vision examination, ideal for a collection of medical instruments, an old ophthalmology cabinet or a scientific cabinet of curiosities.\u003c\/p\u003e","brand":"Brocante Jolbro","offers":[{"title":"Default Title","offer_id":53509414519117,"sku":null,"price":29.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1049\/5053\/files\/20260309_174745.jpg?v=1773124838","url":"https:\/\/brocantejolbro.com\/en\/products\/instrument-optique-ancien-de-test-visuel-stenope","provider":"Brocante Jolbro","version":"1.0","type":"link"}