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US 5,208,615 AGranted
Optical arrangements for reading deficiencies
AssigneeUnisearch Limited
InventorsRobert T. Solman, Stephen J. Dain
Life of this patent
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AssigneeUnisearch Limited
InventorsRobert T. Solman, Stephen J. Dain
Estimating the term…
A method of reducing the impact of a reading deficiency caused by a slow transient response comprises the steps of inserting a light diffuser in a reader's light path to attenuate the high spatial frequency information mediated by the cone receptors of the eye(s) of the reader, and inserting a chromatic filter which limits stimulation to the red and/or green cone receptors relative to stimulation of the blue cone receptors in the eye(s) of the reader whereby the magnitude of the cone mediated sustained response of the reader is reduced towards a more normal balance relative to the impaired transient response of the reader. An apparatus for reducing the impact of a reading deficiency caused by a too slow transient response of a reader comprises a light diffuser and a chromatic filter to limit the red and/or green mediated sustained transmission relative to the blue cone mediated transient transmission, the diffuser and filter being locatable in the reader's light path. Also disclosed is a method of testing a patient for impaired transient response, a test kit for testing for impaired transient response, and an optical prescription lens prescribed in accordance with the above method of testing.
A test kit for testing an eye of a patient for impaired transient response, said kit comprising, in combination:
A method of reducing the impact of a reading deficiency caused by a slow transient response of a reader, said method comprising the steps of inserting a light diffusion means in the reader's light path to attenuate the high spatial frequency information mediated by the cone receptors of an eye of the reader, and inserting a chromatic filter which limits stimulation of the red and/or green cone receptors relative to stimulation of the blue cone receptors in the eye of the reader whereby the magnitude of the cone mediated sustained response of the reader's eye is reduced towards a more normal balance relative to the impaired transient response of the reader's eye.
A method of testing an eye of patient for impaired transient response comprising the steps of:
Apparatus for reducing the impact of a reading deficiency caused by a too slow transient response of a reader, said apparatus comprising light diffusion means and chromatic filter means for modifying light passing through said diffusion means and filter means to an eye of the reader for limiting the red and/or green mediated sustained response relative to the blue cone mediated transient response of the reader's eye, and location means to locate said diffusion means and filter means in the reader's light path.
Dependencies are inferred from the claim text.