Table of Contents
How Homonymous Hemianopia Looks
Homonymous Hemianopia, often caused by stroke, occurs when a patient loses visual field in the same half of each eye.
The images below show how a normal visual field looks compared to the visual field of a patient with homonymous hemianopia.
Normal Visual Field

Hemianopic Visual Field

How the Expanded Visual Field Appears
The goal of the Peli Lens is to help patients make the most use of their remaining vision.
By placing peripheral prisms in the patient’s blind side, they can notice movement and contrast from their missing visual field. This often enables patients to significantly increase their awareness of their blind side.
Below you’ll see a view from above of how a hemianopic patient’s visual looks normally and how the field looks while wearing the Peli Lens.
View from Above
Below you’ll see a view from above of how a hemianopic patient’s visual looks normally and how the field looks while wearing the Peli Lens.
Homonymous Hemianopia Visual Field

Homonymous Hemianopia with the Peli Lens

Video Simulations
The videos below provide simulations of how homonymous hemianopia patients may perceive certain scenarios while wearing the Peli Lens.
Normal vs Hemianopic vs Expanded Visual Fields
Here’s another way to visualize the difference between normal vision, hemianopic vision, and vision using the Peli Lens.

Full Visual Field

Hemianopia Visual Field

Expanded field with superimposed image
Peli Lens Keys for Success
Reacting to the Information from the Expanded Field
Peripheral prisms alert the patient of movement in their blind side so they know to turn and look in that direction. The information in the expanded field can be viewed by the patient moving their eyes or moving their head to focus on that area.
Adapting to Peli Peripheral Prisms
This superimposed field expansion described by Peli Lens wearers can take some getting used to. With training, patients are easily able to differentiate their regular field from the expanded field.
We recommend that a patient wear training prisms for 4-to-6 weeks and spend about 20 minutes a day performing self-training exercises to help with adaptation.
We’ve created a training protocol to help patients with this process.
Success Rates with the Peli Lens
In the initial trial of the Peli Peripheral Prisms, 74% wished to continue wear after the 6-week assessment. At the end of the first year, 47% of patients continued to wear the prisms.
Many doctors have reported success rates much higher than this when the fitting is coupled with multiple training sessions and at-home practice.
Getting the Peli Lens for Your Patients
After more than 20 years helping doctors obtain, fit, and train their patients with the Peli Lens, we’ve streamlined the process into 5 simple steps:
- Ensuring the Peli Lens is the right solution
- Demonstrating field expansion
- Fitting patients with training prisms
- Monitoring at-home training
- Ordering full-power prisms
To explore this process more, visit this page.