发明名称 |
Optometric test chart for computer screen simulation |
摘要 |
A test card for use in eye examinations emulates the light return profile of a video display screen such as those commonly used in connection with computers. The test card is used for prescribing corrective lenses for a computer user. The test card is formed on an opaque planar medium and has a plurality of characters formed thereon for reading by the patient, each character formed by a plurality of pixel elements. The pixel elements may be formed by designing a pattern of dots on a computer system using graphic software for representing the resulting pattern in a machine-readable graphics file. The graphics file is used to control a compatible imagesetter machine for forming the desired pattern on photographic film. According to an alternative method, a film master is prepared in which each pixel is a solid black dot. The test card is prepared by printing the image onto photographic paper through a diffusion element so as to create an approximately Gaussian light return profile across each pixel. |
申请公布号 |
AU8130794(A) |
申请公布日期 |
1995.05.23 |
申请号 |
AU19940081307 |
申请日期 |
1994.11.02 |
申请人 |
PRIO CORPORATION |
发明人 |
JONATHAN G TORREY;COSMO SALIBELLO |
分类号 |
A61B3/02;A61B3/032;H04N1/23;H04N1/40 |
主分类号 |
A61B3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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