Invention Application
- Patent Title: Progressive-power spectacle lens
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Application No.: US10268755Application Date: 2002-10-11
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Publication No.: US20030123025A1Publication Date: 2003-07-03
- Inventor: Moriyasu Shirayanagi
- Applicant: PENTAX Corporation
- Applicant Address: JP Tokyo
- Assignee: PENTAX Corporation
- Current Assignee: PENTAX Corporation
- Current Assignee Address: JP Tokyo
- Priority: JP2001-315280 20011012
- Main IPC: G02C007/06
- IPC: G02C007/06

Abstract:
A progressive-power spectacle lens includes a distance portion having a dioptric power for distance vision, a near portion having a dioptric power for near vision, and an intermediate portion having a progressive dioptric power between the distance portion and the near portion. At least one of front and back surfaces is formed as a progressive-power surface whose dioptric power varies depending upon a position thereon. The spectacle lens has a prismatic effect including a prescribed prismatic effect and unprescribed prismatic effect. A shape of the progressive-power surface of the spectacle lens is different from a shape of a progressive-power surface of a reference lens that is defined as a lens identical to the spectacle lens except that the prescribed prismatic effect is eliminated. The progressive surface of the spectacle lens is configured to compensate for aberration that is caused if the prescribed prismatic effect is added in the reference lens.
Public/Granted literature
- US06652097B2 Progressive-power spectacle lens Public/Granted day:2003-11-25
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