Paper, 'On a portable ophthalmometer' by Thomas Reid

Description

Reid writes: 'The object of the instrument about to be described is to measure the curvature of the central area of the cornea, the polar or optical zone; or of any spherical reflecting surface of from 6 to 10 mm. of radius. In its present form the instrument can only be applied to the measurement of the corneal surface in the visual line. As this is the area of the cornea utilised for distinct vision, this instrument furnishes all the data practically requisite for the diagnosis and measurement of corneal astigmatism.'

Annotations in pencil and ink. Includes one lens diagram.

Subject: Ophthalmology / Scientific apparatus and instruments

Received 1 January 1893. Read 16 February 1893. Communicated by Lord Kelvin [William Thomson].

A version of this paper was published in volume 53 of the Proceedings of the Royal Society as 'On a portable ophthalmometer'.

Reference number

PP/21/1

Earliest possible date

1892-1893

Physical description

Ink and graphite pencil on paper

Page extent

9 pages

Format

Manuscript
Diagram