Transcript Clinical Refraction MISRA Product Specs

Meridional Interactive Subjective Refraction Apparatus
Problem
Clinical refraction involves a set of optical and visual tests that
can be difficult to manage on account of variations in depth of
focus, pupil size, retinal acuity, accommodation, measurement
technique, and peripheral refraction.
Solution
 The Meridional Interactive Subjective Refraction Apparatus
(MISRATM) helps determine optical sphere (myopia/ hyperopia)
and astigmatism (meridional toroid) by principles of visual
psychophysics embodied in robotic technology and succeeds
where other state-of-the-art methods are less reliable.
MISRA™ Visual Task
Patients are instructed to respond manually to a task that requires
them to choose the clearer of two adjacent targets presented
laterally.
MISRA™ Key Features
Target position within a table-top device
substitutes lens power in a phoropter.
2. Patient interacts with the robotic technology
of the device under supervision.
3. Multiple spatial scales enable macular as well
as foveolar refraction.
4. Accurate subjective refraction enabled in
various eye disorders and disease states.
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MISRA™ Design Advantages
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Presents discernible differences in blur
Eliminates use of Jackson’s crossed cylinders
Easy to use despite retinal damage
Consistent despite media opacities
Unaffected by pupil size or shape
Repeatable despite irregular astigmatism
Can be configured for night myopia
Optional visual psychophysical tests available
MISRA™ Managerial Advantages
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Saves exam room space
Reduces time spent by doctor on refraction
Easily supervised by non-clinical professionals
Consistent method across clinic staff
Design features enhance patient compliance
Brings science to the art of refraction
Web portal enables collaborative research
References
1.
Aggarwala K. Apparatus and method for subjective
determination of the refractive error of the eye. 2011;
www.uspto.gov; 7963654.
2.
Aggarwala KR, Kruger ES, Mathews S, Kruger PB.
Spectral bandwidth and ocular accommodation. J
Opt Soc Am A Opt Image Sci Vis. 1995 March;
12(3):450-5.
3.
Aggarwala KR, Nowbotsing S, Kruger PB.
Accommodation to monochromatic and white-light
targets. Invest Ophthalmol Vis Sci. 1995 December;
36(13):2695-705.