Prisma foil (press on prism foil) from Fresnel for orthoptic diagnostics and therapy. Especially for pre-operative prism compensation and medium-term application at unstable angles. The adhesive foil is statically adhesive and can be cut to size.
The self-adhesive prism foils are particularly practical and easy use. The foils can be applied quickly and easily to the lens and ensure the correct prism compensation.
Order press-on prism foil
Self-adhesive prism sheets for preoperative or medium-term prism compensation
Available strenghts: 1 to 35 cm / m pdpt
Content: 1 slide with instructions
Material: high-quality plastic
Size: 67 x 67 mm
The self-adhesive prism foils are optimally applicable as a temporary solution until the corrective operation. They are also suitable for intermediate use in general conditions (such as diabetes). The high-quality plastic ensures excellent image quality.
How long a prism is needed depends upon your individual needs and your eye condition. Sometimes a prism is needed for several months, but the strength of it changes as your eye condition stabilises.
Most common reasons for using a foil
There are many reasons for using a fresnel prism. Your orthoptist will discuss with you the reason why you have been advised to use one. The most common reasons are to:
investigate whether your brain has the potential to use your two eyes together as a pair
stop double vision (diplopia)
use alongside eye exercises which you have been given by your orthoptist
predict the outcome of squint surgery.
Advantages prism foil
Relieves double vision
Easy to (keep) clean
It is easy to remove the foil after use
Easy to change prism strength as your eye condition changes
Prisms creates a natural blurry image, because of the lines that are on the plastic prism.
They have to be fitted onto a glasses lens. If you do not need glasses to correct your eyesight, a pair can be made up with plain glass.
The Fresnel prism foil is available in the following strengths Δ: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 17.5, 20, 25, 30 and 35 Δ
This is the laminated version of the Hardy Rand Rittler Test (4th edition). HRR colour test with 20 plates. This book includes 4 demonstration plates, 6 plates for Screening, 14 plates to diagnose color deficiency.
The HRR is available from stock and will be shipped within 24 hours.
Ishihara Colour Deficiency Test with 24 Plates. This test can used to test on protan & deutan defects. Patients must identify numbers or patterns formed in a matrix of small coloured dots varying in colour & intensity (pseudo-isochromatic plates). Ideal for commercial/ industrial colour screening.
We have this Ishihara test available from stock, worldwide delivery.