Method for eliminating error in tonometric measurements

A pressure, difference technology, applied in the novel intraocular pressure measurement field, can solve the problem of corneal rigidity effect, etc.

Inactive Publication Date: 2010-12-08
REICHERT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Likewise, the use of non-contact tonometers that require the delivery of additional pulse energy to the eye is fundamentally incompatible with non-contact tonometers designed to reduce the discomfort experienced by the patient from the gas jet , and may not be necessary in cases where the patient's IOP values ​​are well within the standard range
Also, the methods of internal / external tonometry described above are specific to non-contact tonometers and do not address the issue of corneal rigidity effects when they relate to contact methods of tonometry

Method used

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  • Method for eliminating error in tonometric measurements
  • Method for eliminating error in tonometric measurements
  • Method for eliminating error in tonometric measurements

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Embodiment Construction

[0028] in the attached picture figure 1 A hand-held non-contact tonometer 10 (NCT) embodying the invention is shown. Although the method of the present invention is described in connection with a hand-held non-contact tonometer, it may also be embodied in a table-top non-contact tonometer. In addition, the method of the present invention is applicable to both non-contact and contact tonometers. A non-contact tonometer (NCT) 10 includes a handle portion 12 and a head portion 14 at the top of the handle portion. The handle portion 12 houses a rechargeable power source powered by the alignment and tonometer system carried by the head portion 14 . figure 1 Also seen in the figure are an operator's eyepiece 16 at one end of the head portion 14, a front window 18 at the opposite end of the head portion 14 facing the patient, and a button control surface 22 angled towards the operator near the operator's eyepiece 16. LCD display 20.

[0029] figure 2 The alignment and tonomet...

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Abstract

A novel tonometry method wherein measured intraocular pressure corresponding to inward applanation of the cornea and corneal hysteresis derived from a pressure differential associated with inward and outward applanation events in the same measurement pulse allows comparison with a predetermined population normality function to avoid corneal effects so that the actual status of intraocular pressure can be ascertained. A dual mode non-contact tonometer allows selection between a standard measurement mode for patient comfort and an alternate measurement mode wherein pressure-time characteristicsof the fluid pulse are varied to allow additional observation of corneal hysteresis associated with the dynamic measurement process for carrying out the novel tonometry method. Corresponding tonometry method embodiments include a method adapted for a contact tonometer and a method based on a pair of non-contact tonometer measurements taken using different air pulse pressure ramp rates.

Description

technical field [0001] The invention mainly relates to the field of ophthalmic instruments, in particular to a novel intraocular pressure measurement method suitable for contact and non-contact tonometers. Background technique [0002] Tonometers that measure IOP (intraocular pressure) were originally developed as "contact" instruments, meaning that part of the instrument is in contact with the cornea during the measurement. A well-known instrument of this type is the Goldmann applanation tonometer developed in the 1950s. GAT (Goldmann applanation tonometer) measures the force required to applanate ("applate") a known area of ​​the cornea, and is still used today as a standard for calibration and comparison of other types of tonometers for evaluation Measurement accuracy. [0003] Patient discomfort associated with the use of contact tonometers such as the GAT and the need to use anesthesia have led to the development of "non-contact" tonometers (NCTs) that work by applyin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/16
CPCA61B3/165
Inventor D·A·鲁塞
Owner REICHERT
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