MEASURING OUTFLOW RESISTANCE/FACILITY OF AN EYE
First Claim
1. A method for measuring an outflow resistance of an eye, the method comprising:
- applying a pressure to an eye;
measuring the applied pressure;
directly measuring a volume change of the eye created by the applied pressure to the eye;
computing an outflow rate of fluid from the eye based on the measured volume change of the eye over time; and
determining the outflow resistance of the eye as a function of a ratio of the applied pressure and the outflow rate.
1 Assignment
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Accused Products
Abstract
A measurement system takes measurements of intraocular pressure and displaced ocular volume for determination of aqueous outflow resistance A device with a πgid outer wall, a flexible inner wall, and an inflatable bladder in between is placed over the eye A pressure measurement system is coupled to the bladder and is configured to measure a pressure of fluid within the bladder A hydraulic unit is coupled to the bladder and configured to control a flow of fluid between the bladder and an external reservoir, and to measure a change of volume in the bladder created by the pressure applied to the eye Both the pressure measurement system and hydraulic unit are directly controlled by and communicated with a microprocessor/computer In addition, the microprocessor computes the outflow resistance of the eye as a function of the pressure in the bladder and the change of volume in the bladder over time.
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Citations
22 Claims
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1. A method for measuring an outflow resistance of an eye, the method comprising:
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applying a pressure to an eye; measuring the applied pressure; directly measuring a volume change of the eye created by the applied pressure to the eye; computing an outflow rate of fluid from the eye based on the measured volume change of the eye over time; and determining the outflow resistance of the eye as a function of a ratio of the applied pressure and the outflow rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for measuring an outflow resistance of an eye, the system comprising:
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a contact-lens device comprising a rigid outer wall, a flexible inner wall, and an inflatable bladder disposed therebetween, the contact-lens device having a concave shape to allow placement over an eye wherein the flexible inner wall contacts the eye; a pressure measurement system coupled to the bladder and configured to measure a pressure of fluid within the bladder and applied to the eye; a hydraulic unit coupled to the bladder and configured to control a flow of fluid between the bladder and an external reservoir, and further configured to measure a change of volume in the bladder created by the pressure applied to the eye; and logic configured to compute the outflow resistance of the eye as a function of the pressure in the bladder and the change of volume in the bladder over time. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A computer program product for measuring an outflow resistance of an eye, the computer program product comprising a computer-readable storage medium containing computer program code that comprises:
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receiving a pressure measurement representing an applied pressure to an eye; receiving a set of volume measurements representing a directly measured volume change of the eye created by the applied pressure to the eye; computing an outflow rate of fluid from the eye based on the measured volume change of the eye over time; and determining the outflow resistance of the eye as a function of a ratio of the applied pressure and the outflow rate, and using a biomechanical model of the eye to model dynamic effects. - View Dependent Claims (20, 21, 22)
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Specification