Axiell Internet Server 6 | Details | Keeler "Vertex Dioptrescope" Electric Focimetre

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Actions	Keeler "Vertex Dioptrescope" Electric Focimetre Remove from selection Add to selection Object numberED.CS.2017.170 TitleKeeler "Vertex Dioptrescope" Electric Focimetre CreatorKeeler DescriptionAn early model (Model No. 268) of the "Vertex Dioptrescope" manufactured by Keeler. Focimetres were used to check whether the spectacles supplied to a patient matched the required specification (as opposed to identifying their prescription). If a patient had lost their previous prescription, the focimetre was necessary to test their current eyewear to see if it needed replacing following the latest eye examination. The first focimetre was introduced in America in 1912, its design originally based on a telescope and a test target. Keeler introduced their "Vertex Dioptrescope", the first British focimetre, in 1946. This was the company's only attempt at a focimetre. The development costs were immense and they decided not to update it even though it had proved popular. Later models were grey, meaning this black example would be one of the earlier models to be built. The dioptrescope was manufactured until about 1951, and was available from optical suppliers into the 1960s. The focal scale is read through the upper mirror set-up and measures to one eighth of a dioptre. EYE. 1999. 589 Production date Production period1940s Object nameElectric Focimetre Object categoryINSTRUMENT Dimensions Height: 30 cm Width: 30 cm Depth: 18 cm

Object numberED.CS.2017.170

TitleKeeler "Vertex Dioptrescope" Electric Focimetre

DescriptionAn early model (Model No. 268) of the "Vertex Dioptrescope" manufactured by Keeler. Focimetres were used to check whether the spectacles supplied to a patient matched the required specification (as opposed to identifying their prescription). If a patient had lost their previous prescription, the focimetre was necessary to test their current eyewear to see if it needed replacing following the latest eye examination. The first focimetre was introduced in America in 1912, its design originally based on a telescope and a test target. Keeler introduced their "Vertex Dioptrescope", the first British focimetre, in 1946. This was the company's only attempt at a focimetre. The development costs were immense and they decided not to update it even though it had proved popular. Later models were grey, meaning this black example would be one of the earlier models to be built. The dioptrescope was manufactured until about 1951, and was available from optical suppliers into the 1960s. The focal scale is read through the upper mirror set-up and measures to one eighth of a dioptre. EYE. 1999. 589

Production date

Production period1940s

Object nameElectric Focimetre

Object categoryINSTRUMENT

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