Visionaries
Eye Dominance Detection Instrument (EDDI)
Product Requirements Document
Document Number 00001
Revisions Level Date
D 12-12-2014
This is a computer-generated document. The electronic master is the official revision. Paper copies are for reference only. Paper copies may be authenticated for specifically stated purposes in the authentication block.
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Authentication Block
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Rev
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Description
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Date
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Authorization
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A
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Initial PRD
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10-27-2014
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CAM, KML, YQ, ZZ
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B
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Updated PRD
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11-11-2014
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CAM, KML, YQ, ZZ
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C
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Updated PRD
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12-03-2014
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CAM, KML, YQ, ZZ
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D
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Updated PRD
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12-12-2014
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CAM, KML, YQ, ZZ
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The EDDI is a senior design project. Its design inputs were derived from our interactions with our clinical and research partners, Scott MacRae and Len Zheleznyak.
Vision:
The product vision as stated in “Eye Dominance Detection Instrument Rev D” is a phablet to quantitatively measure eye dominance in humans in an efficient amount of time.
Environment:
As a clinical device, it needs to operate in the following environment:
Temperature
55-85 F – operation range
Relative Humidity
Non-condensing – safe operation
10-85% - meets specifications
Phablet used in conjunction with EDDI contains a rechargeable battery.
During normal operation, may come into contact with a patient's face. It must be cleanable/ easily sanitized.
Should be used with instruction from a clinical assistant
Regulatory Issues:
No current restrictions.
Scope:
We are responsible for:
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Condensing the current eye dominance test to a portable device.
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Choosing a phablet
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Designing and constructing the housing
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Selecting and purchasing lenses
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Designing and debugging phablet app
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Research on making device commercially available in both clinical and non-clinical settings.
We are not responsible for:
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Mass producing EDDI
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Functionality with other phablets
Fitness for use:
The phablet will:
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Be capable of quantitatively measuring eye dominance
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Generate two independent patterns of sinusoidal fringes of a frequency of 4 cycles/degree with changeable contrasts; one for each eye
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Display patterns oriented perpendicular to one another
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Require that the image subtends an angle of 1 degree onto retina
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Include a square box around the pattern used to ensure the individual patterns overlap in patient’s vision, as seen below:
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Correct gamma curve for a linear increase in gray levels
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Allow patient to convey which pattern orientation is visible in real time
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Generate numerical value representing right eye-left eye contrast ratio based on patient input and contrast values
The housing will:
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Contain two achromatic doublets; one for each eye
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Hold lenses one focal length away from screen to ensure light comes out collimated as shown below:
LENS SPECIFICATIONS
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Aperture Diameter
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25 mm
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Focal Length
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~50 mm
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Thickness
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<15 mm
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Number of Elements
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2
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Spectrum
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Visible (400-700 nm)
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Aberration Correction
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Chromatic and Spherical
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It is desirable that:
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Patient can adjust one pattern position on screen
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Housing will allow for lens adjustment based on patient eye-spacing
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Test will take less than one minute
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The phablet can process vocal input from patient
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The housing design is aesthetically fit for a clinical setting
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The system costs less than $2000
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The system has a cheaper version for more widespread use