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Ophthalmology. In ophthalmology, horror fusionis is a condition in which the eyes have an unsteady deviation, with the extraocular muscles performing spasm-like movements that continuously shift the eyes away from the position in which they would be directed to the same point in space, giving rise to diplopia. Even when the double vision images ...
The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]
Perger prism. A Perger prism or Perger–Porro prism system is a prism, that is used to invert (rotate by 180°) an image. The special feature of this prism is that, like a traditional double Porro prism system, it manages this with only four beam deflections and has neither a roof edge with the accompanying phase correction problems, a ...
Form 1040, officially, the U.S. Individual Income Tax Return, is an IRS tax form used for personal federal income tax returns filed by United States residents. The form calculates the total taxable income of the taxpayer and determines how much is to be paid to or refunded by the government. Income tax returns for individual calendar-year ...
Form W-9, 2011. Form W-9 (officially, the " Request for Taxpayer Identification Number and Certification ") [1] is used in the United States income tax system by a third party who must file an information return with the Internal Revenue Service (IRS). [2] It requests the name, address, and taxpayer identification information of a taxpayer (in ...
The Internal Revenue Service ( IRS) is the revenue service for the United States federal government, which is responsible for collecting U.S. federal taxes and administering the Internal Revenue Code, the main body of the federal statutory tax law. It is an agency of the Department of the Treasury and led by the Commissioner of Internal Revenue ...
Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°. A double Porro system provides four ...
You may have to pay federal income taxes on your Social Security benefits if you: File a federal tax return as an individual. If your combined income is between $25,000 and $34,000, you may have ...