Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1978-10-30
1980-07-22
Corbin, John K.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356125, G01B 900
Patent
active
042137012
ABSTRACT:
An apparatus and method for measuring the dioptric power, resolving power, and astigmatic power of small lenses, and particularly for testing the acceptability of surgically implantable intraocular lenses. The apparatus is comprised of an optical system which images a reticle at its focus. The optical system includes a light source which is condensed on a test reticle which in turn is focused on a reference surface from which the measurements are made. A lens to be tested is positioned with its posterior surface coincident with the plane on which the reticle is focused. A conjugate viewing system is provided at 90.degree. to the imaging system for viewing the image of the reticle focused on this plane. Adjusting means are provided for positioning the reticle image to coincide with the second focal plane of the lens being tested. The reticle image in this plane is converted to a colored image to distinguish it from the first focused image at the reference surface. A measuring instrument connected to the adjustment system measures the distance of the movement in adjusting the image of the reticle from the reference surface to a digital read-out. By provision of a suitable pattern on the test reticle, and a method of mechanically rotating this reticle through 180.degree., the image in the focal plane of the lens to be tested is used to simultaneously test the quantitative measures of the optical parameters which include dioptric power, resolving power and astigmatic power.
REFERENCES:
Smith, Warren J., Modern Optical Engineering, McGraw-Hill, N.Y., 1966, pp. 434, 435.
Hume, K. J., Metrology with Autocollimators, Hilger & Watts Ltd., London, 1965, pp. 6-10.
Arnold Bruce Y.
Corbin John K.
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