What are Peli prisms?

What are Peli prisms?

A Peli prism lens aims to expand your peripheral visual field if you have a homonymous hemianopia. It works by using high powered prisms to shift the image from the side with visual field loss onto the other side where you can see it.

What is complete Hemianopsia?

n. Hemianopsia affecting a full half of the visual field of each eye.

What is Pelli prism?

The Peli Lens is a mobility aid for people with homonymous hemianopia. It is also known as “EP” or Expansion Prism concept and was developed by Dr. Eli Peli of Schepens Eye Research Institute in 1999. It expands the visual field by 20 degrees.

What is yoked prism?

Yoked prisms are prisms of equal power positioned in front of both eyes such that their bases are oriented in the same direction.

What does a Peli prism lens do for homonymous hemianopia?

What does a Peli prism lens do? Peli prism lens aims to expand your peripheral visual field if you have a homonymous hemianopia. It works by using high powered prisms to shift the image from the side with visual field loss onto the other side where you can see it.

How does the Peripheral prism of the Peli Lens work?

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. This “ghost image” field expansion described by Peli Lens wearers does take some getting used to.

How does the Peli Lens help the blind?

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.