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What is Homonymous Hemianopia (HH)?
What is Homonymous Hemianopia (HH)?
HH is the visual field loss on the same side of both eyes
HH is the visual field loss on the same side of both eyes
Leading Causes of HH (n = 904)
Leading Causes of HH (n = 904)
Zhang et al (2006)
All leading causes of HH result in damage to a brain region associated with vision in one of the two brain hemispheres.
All leading causes of HH result in damage to a brain region associated with vision in one of the two brain hemispheres.
(Left) Healthy Vision (Right) HH Vision
(Left) Healthy Vision (Right) HH Vision
Patients perceive their vision as a continuum, often not realizing they are missing half of their vision. This results into frequent bumping into objects, difficulty reading and potential life-threatening situations, especially when driving or walking in busy streets.
Patients perceive their vision as a continuum, often not realizing they are missing half of their vision. This results into frequent bumping into objects, difficulty reading and potential life-threatening situations, especially when driving or walking in busy streets.
Market Estimation
Market Estimation
There are approximately 1 million people in the U.S. who have Homonymous Hemianopia
There are approximately 1 million people in the U.S. who have Homonymous Hemianopia
Based on ICD-9 statistics on low vision, number of HH patients and cost of current treatments for HH, we estimated that this market is valued at
Based on ICD-9 statistics on low vision, number of HH patients and cost of current treatments for HH, we estimated that this market is valued at
$ 100 million
$ 100 million
The market can be subdivided into disease models/simulations and treatments
The market can be subdivided into disease models/simulations and treatments
Current HH Disease Models
Current HH Disease Models
Goggles
Goggles
Issue: Restricted vision is not perceived centrally
Issue: Restricted vision is not perceived centrally
Reading Simulation
Reading Simulation
Issue: Only simulates one aspect of daily activities that patients with hemianopia have difficulty with
Issue: Only simulates one aspect of daily activities that patients with hemianopia have difficulty with
Current Treatments for HH
Current Treatments for HH
Peli Lens
Peli Lens
Issues:
Issues:
- Limited field expansion
- Field expansion is displayed as ghost image, which obstructs central vision.
Compensatory Therapy
Compensatory Therapy
Issue: Constant eye movement can be uncomfortable, not effective at detecting fast moving objects
Issue: Constant eye movement can be uncomfortable, not effective at detecting fast moving objects
Fresnel Prism
Fresnel Prism
Issue: User needs to redirect vision to periphery to obtain cues
Issue: User needs to redirect vision to periphery to obtain cues
Competitive Landscape
Competitive Landscape
The current HH simulation models are too simple and thus limit the understanding of this disease for the design of new HH devices.
The current HH simulation models are too simple and thus limit the understanding of this disease for the design of new HH devices.
The current HH treatments are suboptimal in terms of degrees of expansion and comfort for user.
The current HH treatments are suboptimal in terms of degrees of expansion and comfort for user.
Solution: We propose using virtual and augmented reality tools to address this clinical need.
Solution: We propose using virtual and augmented reality tools to address this clinical need.
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