Electronic astigmatic chart and method for measuring astigmatism focal power
An astigmatism meter and optical power technology, applied in the field of optometry, which can solve the problems of long optometry time and patient fatigue.
Inactive Publication Date: 2016-02-24
张仕郎
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Problems solved by technology
[0002] In existing technology to measure astigmatism focal power, when the miscorrection of the cylindrical lens test piece is greater than -0.25D, the spherical lens needs to be adjusted again, and the two variables of the spherical lens and the cylindrical lens are changed at the same time, resulting in a longer optometry time and making the patient feel tired
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[0025] Example, Patient F: Right eye, implanted with -3.25DS, can see 0.6 optotype.
[0026] Putting a traditional astigmatism meter, the lines of 3 and 9 are relatively clear.
[0027] The astigmatism axis is 106 degrees through the two-color axial astigmatism table (see ZL201410047800.9).
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The invention discloses an electronic astigmatic chart for measuring astigmatism focal power. The electronic astigmatic chart comprises a plurality of astigmatic axes intersecting at one point and vision test letters located at two ends of the astigmatic axes, and the vision test letters at two ends of each astigmatic axis are identical in size. During the whole process of astigmatism focal power measuring, only a cylindrical lens is adjusted instead of adjusting of the cylindrical lens and a spherical lens, and the astigmatism focal power can be measured fast and accurately.
Description
technical field [0001] The invention relates to the field of optometry, in particular to an electronic astigmatism meter and a measuring method for measuring astigmatism focal power. Background technique [0002] The existing technology measures astigmatism focal power. When the miscorrection of the cylindrical lens test piece is greater than -0.25D, the spherical lens needs to be adjusted again, and the two variables of the spherical lens and the cylindrical lens are changed at the same time, resulting in a long optometry time and making the patient feel tired. Contents of the invention [0003] The object of the present invention is: in order to solve the above-mentioned problems, a method for measuring the astigmatism focal power with an electronic astigmatism meter is provided, which can quickly and accurately measure the astigmatism focal power. [0004] In order to achieve the above object, technical scheme of the present invention is: [0005] An electronic astigma...
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CPCA61B3/036
Inventor 张仕郎
Owner 张仕郎
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