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Soluzioni per ipovedenti

FILTER LENSES

The best protection for the visually impaired

Nanometer-controlled medical filter lenses.
In addition to visible light, infrared and ultraviolet radiation reach our eyes. These, although they do not cause visual sensations, are to be considered dangerous to the eye itself. Ultraviolet, in particular, although short-wave radiation is endowed with high energy capable of causing conditions of photooxidative stress resulting in cortical cataracts, conjunctivitis and worsening of retinal pathologies. Blue light from ultraviolet radiation also causes reduced contrast perception, resulting in reduced visual acuity, increased sensitivity to bright light and glare, prolonged adaptation time.

The use of Skudo Coal treatments and medical filter lenses can rebalance these conditions by "cutting' the blue component of light. In combination with polarization, available in two versions, Pola Light 65% and Polo Dark 86%, visual performance in the outdoor environment is amplified, with great comfort for the visually impaired patient.

Such treatment is available on:

Neutral filters base 6 and base 8
Polarized neutral filters base 6 and base 8
Infinity - White, polarized or photochromic monofocal ophthalmic lenses
Infinity - White, polarized to photochromic bifocal ophthalmic lenses
Infinity - White, polarized or photochromic progressive ophthalmic lenses
Freedom ophthalmic lenses
Clip-on

The following filters are recommended for major retinal diseases:

However, the most authoritative specialists recommend subjective testing to evaluate the best filter to use. Oculus filters or flirp splints are available for testing. All medical colorings have been certified in order to ensure the highest quality.

Of particular note is the new Skudo MD outdoor maculopathy lens. Skudo MD's Retina-Guard Treatment can eliminate blue light, the cause of photochemical damage to photoreceptors, increase contrast and reduce light scattering in the eyes. The result is pure and natural vision. Skudo MD is available as a clip-on, neutral filter and graduated lens.

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HYPERCORRECTIVE SYSTEMS

the best HYPERCORRECTIVE SYSTEMS FOR LOW VISION

Legit Aplanat is a monocular aplanatic system particularly suitable when medium to high magnifications are needed. It consists of a doublet of two convex plane positive lenses. Aplanat systems have the property of evenly scattering light over the entire surface of the lens, ensuring a 'high-quality, uniform image free of peripheral aberrations. The two lenses are mounted on a tubular polycarbonate mount, and the flat surfaces of the lenses face outward. Indeed, it is well known that the closer you get to the object, the more important it is that the lens surface be as flat as possible Caplanatico is now the only optical system for the visually impaired that can combine high magnification and wide angle of view (48). Available from 2 to 15 magnifications. Legit Aplanat is available with eventuate patient dioptric correction and medical staining.

Mounting
Mounting the systems is extremely simple. A 70-mm support lens drilled in the centre is supplied with the aid. A central locking disk is provided for cutting at the grinding wheel, which is to be fixed with special tape on both surfaces. Once the lens is shaped and the central disk removed, the system is press-fit into, taking great care to keep it as close to the eye as possible in order to increase the field angle.

Frames
The great virtue of Legit Aplanat is that it offers maximum autonomy to the visually impaired person in choosing a frame.

Our company, which has been engaged in the research and development of optical systems for the visually impaired for many years now, has created a new aplanatic and achromatic aid by exploiting the well-known characteristics of optical systems consisting of cemented doublets. The use of appropriate geometries, combined with the choice of two different lenses of different prime mineral glass, ensures excellent image quality. The system consists of a 26mm-diameter doublet combined with a supporting lens made of organic material.

Compared with a conventional 36mm diameter aplanatic system, the field loss is reduced to only 3 letters (based on a 6x and 10 print body).

The aesthetic appearance is the best in its class, and the optical quality is the same as that of an aplanatic system.

The features of Legit Twin can be summarized as follows:

Aplanatic and achromatic system due to the use of special glass
Breakage resistant due to chemical and thermal tempering treatment
Multilayer MgF anti-reflective treatment
Thin thanks to a thickness at the center between 38 mm for the 2x (vs 90 of a traditional aplanatic system) and 585 mm for the 6x (vs 120 of a traditional aplanatic system

Legit Twin is available with possible patient dioptnic correction up to a total power of Sf 24.00 and Cyl-4.00 (sum of patient correction and magnifying power).

Legit Bino is a prismatic hypercorrective eyeglass that enables the visually impaired person to read at a short distance by creating a magnified image at the retinal level and with minimal convergent effort. In fact, thanks to the use of internally based prisms obtained during lens generation, Legit Bino enables high visual performance, thanks also to a careful frame design, made of acetate with flexible temples. Legit Bino is the most discreet low vision aid on the market. It can be prescribed with optical correction and medical filter.

The optical effects

Interpupillary distance
The position of the eye in relation to the optical center of the lens, and practical experiments carried out in different Rehabilitation Centers, defines the amount of prism used. For example, an eye looking through a positive lens with the optical center off-center nasally actually uses an inner-base prism. So a patient who has a wide Pd uses more inner-base prism than a patient with narrow Pd. By making a calculation on this phenomenon, it is shown that the positive effect of a wide Pd is cancelled out by the negative effect of more convergence needed. It follows that interpupillary distance is not as important in binocular prism systems

Cylinder
A survey of 500 patients by Dr. Gerald Fonda, a well-known American low vision pioneer, found that cylindrical correction below 25dpt does not significantly change the quality of vision. However, we believe that correction of astigmatism against rule or oblique, even minor astigmatism, should be compensated for, and in any case the patient's subjective response should always be evaluated.

Anisometropia and visus
Again from the studies done by Fonda, it is found that a difference within 3dpt between the right and left eye is tolerated by the patient, even if the visus is better in one eye. This confirms the great flexibility of these aids. Reading distance affects the amount of prism needed. What distance is achieved depends partly on the power of the aid, but also on the patient's basic refraction. The reading distance cannot only be decided by the power of the aid, but can vary from one patient to another.

Example
A patient A with a base correction of +3.00dpt and with an aid of 800 gets an addition of 500dpt. The reading distance will be 20cm and the prism will be calculated on the basis of +5.00 power. A patient B with a base correction of -2.00dpt and with an aid of -8.00 gets an addition of +10.00dpt. The reading distance will be about 10cm and the evening prism calculated on the basis of +10.00 power.

Convergence
Prism corrective systems give very close focusing distances because of the high diopters. The use of prisms will shift that plane to a more distal position so that the effort in convergence is reduced.

Legit Galieo Wide 1.8x is a new Galilean wide-angle system (24') and is particularly suitable for TV observation. Thanks to special additional cups, the working distance can be between infinity and 63mm, with magnifications up to 7.2x.

The additional cups are very practicalHE to insert thanks to an interlocking system and are available in:

+0.50 | +1.00 | +2.00 | +3.00 | +4.00 | +6.00 | +8.00 | 10.00 | 12.00 | +14.00 | +16.00.

A special adapter ring can mount the patient's refraction and any medical filter.

The Galilean system is also available in 2.1x (20') and 2.5x (16') powers.

Legit Freedom is a practical and aesthetic hypercorrective solution. The advanced technology used in the construction of freedom lenses. It allows the creation of high-powered bifocal lenses, with the possibility of different cylindrical and/or prismatic corrections between the various lens portions. The use of such technology, allows the Rehabilitation Manager to create 'tailor made' solutions, tailored to the patient.

Types

Legit Freedom are available in different types. However, the Low Vision Practitioner can also choose a lenticule shape not in the catalog, as long as it is feasible.

The formats currently available are as shown below:

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