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Bangerter Occlusion Foil

€5,70 excl. VAT

Bangerter occlusion foil (occlusive foil) of 6 x 6 cm. Available in different grades. From the Swizz manufacturer Ryser Optik.

We have these foils available from stock, worldwide shipping.

Strength foil

Clear

SKU: N/A Categories: Vision – Prisms, Vision – Refraction, Vision Tests Brand: Ryser Optik

Description

The Bangerter occlusion foil from Ryser Optik is a self-adhesive occlusion foil for glasses, designed to reduce visual acuity in one eye. Bangerter foils are commonly used in ophthalmology and orthoptics for amblyopia, diplopia and occlusion therapy.

The foil measures 6 × 6 cm and is available in different grades of visual acuity reduction. It can easily be cut to the required size and applied to the inside of a spectacle lens.

We supply original Ryser Bangerter occlusion foils from stock and offer worldwide shipping.

Bangerter occlusion foil for glasses

These Bangerter foils are made of thin vinyl and are comparable to the Fresnel prisms. However, the Bangerter occlusion foils are thinner than the Fresnel foils. The manufacturer of these films is Ryser Optik.

Size of the foil is 6 x 6 cm

Instruction for applying the foil

The film can be cut to size as desired and applied to the inside of the lens with water. Below is a brief instruction:

Cut the foil to the shape of the lens, 1 mm smaller so that the foil stays within the lens.
Clean and degrease the lens and also the shiny/ glossy side of the occlusion foil.
Place the foil on the wet inside of the lens, press it and let it dry until you no longer see air bubbles.
Leave for at least 1 hour to achieve desired degree of occlusion.

Available occlusive foils

Bangerter occlusion foils are available in different grades. The grade indicates the intended reduction in visual acuity: the lower the value, the stronger the visual suppression.

The occlusion foils are available in the following degrees of light transmission (vision reductions):

0.0 lightperception (LP, no sight but with light perception)
<0.1 (20/300)
0.0 (full occlusive, no sight and no light perception)
0.1 (20/200)
0.2 (20/100)
0.3 (20/70)
0.4 (20/50)
0.6 (20/30)
0.8 (20/25)
1.0 (20/20)

If we look at the strengths, the lower the strength/density of the foil, the less visibility. The foil with 1.0 therefore lets the most light through and the foil with <0.1 the least light.

Light perception (LP) is the perception of light but no sight. At 0.0 no light/vision can be observed at all, it is completely occlusive. If we put this in a table with the expected vision, it comes down to the following:

Grading of Foil and Expected Visual Acuity

Density of Foil	Snellen Visual Acuity
1.0	20/20
0.8	20/25
0.6	20/30
0.4	20/40
0.3	20/80
0.2	20/100
0.1	20/200
<0.1	<20/300
LP	No sight but light perception
00	No sight, no light

Source

The official instructions for use can be downloaded through this link.

Bangerter occlusion foil for amblyopia and diplopia

Bangerter foils are widely used as a form of graded occlusion. Instead of completely blocking one eye with an eye patch, the visual acuity of one eye can be reduced gradually by selecting an appropriate foil strength.

This makes Bangerter occlusion foil particularly suitable for: