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Publication Number
US-12714602-B2
Publication Date
2026-08-25
Expiration Date
Abstract
A system for generating an ophthalmic nomogram for treating an eye includes a computer. The computer stores post-operation refraction data. The post-operation refraction data comprises notations that comprise a sphere and a cylinder and describe a post-operation correction. The computer creates a nomogram data set comprising selected spheres by performing the following for each notation: if the notation is expressed as a plus notation, determine a minus notation corresponding to the plus notation; if the notation is expressed as a minus notation, determine a plus notation corresponding to the minus notation; identify whether the plus notation or the minus notation has a lower absolute sphere; designate the lower absolute sphere of the identified notation as a candidate sphere; and determine whether to designate the candidate sphere as a selected sphere. The computer program calculates the ophthalmic nomogram from the selected spheres.
Core Innovation
The invention generates an ophthalmic nomogram from post-operation refraction data associated with target corrections. For each notation, the computer determines corresponding plus and minus notations, identifies which has the lower absolute sphere, designates that sphere as a candidate sphere, and determines whether it is selected. The nomogram is calculated from the selected spheres, including by relating post-operation spheres to their associated target spheres.
The described problem is bias arising from notation preferences and misleading spherical components in mixed astigmatism. The system applies configurable inclusion or exclusion rules for cases in which the absolute cylinder equals twice the absolute sphere and for mixed astigmatism, and may balance plus and minus selections. The illustrated comparison shows the novel-method fit closer to perfect agreement than the traditional-method fit.
Claims Coverage
The three independent claims are claims 1, 14, and 21, representing three inventive features. They cover two systems and a method for generating an ophthalmic nomogram, with claim 21 specifying selection, distribution, regression, patient-class filtering, treatment planning, and laser-device features.
Computer system for generating an ophthalmic nomogram
Claim 1 covers a computer that stores post-operation refraction data and creates a nomogram data set by converting each notation between plus and minus forms, identifying the notation with the lower absolute sphere, deciding whether to select its candidate sphere, and calculating the nomogram from selected spheres.
Method for generating an ophthalmic nomogram
Claim 14 covers storing post-operation refraction data, determining corresponding plus and minus notations, identifying the lower absolute sphere as a candidate sphere, deciding whether it is selected, and calculating the ophthalmic nomogram from the selected spheres.
Integrated nomogram and eye-treatment system
Claim 21 covers a computer-and-laser system that applies inclusion or exclusion decisions for the stated cylinder-to-sphere relationship and mixed astigmatism, distributes selected plus and minus notations, and calculates the nomogram using regression analyses, including analyses for diopter ranges and a patient-class subset. The system plans treatment according to the nomogram, and a laser device performs the treatment.
The independent claims cover computer-based and method-based generation of an ophthalmic nomogram through selection of sphere values from plus and minus notations. The most detailed system claim also specifies selection rules, distribution of selected notations, regression analysis, patient-class filtering, treatment planning, and laser performance of the treatment.
Stated Advantages
Reduces bias from notation preferences and misleading spherical components in mixed astigmatism.
The illustrated comparison shows the novel-method fit closer to perfect agreement than the traditional-method fit.
Documented Applications
Generating an ophthalmic nomogram for treatment of an eye and planning treatment according to that nomogram; the system may include a laser device configured to perform the treatment.
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