Zeltzer X Chrom Soft Lens
The ZELTZER X-CHROM™ lens is a monocular soft contact lens that, when fitted to the non-dominant eye, significantly enhances color perception for those with a red-green color deficiency. Persons with red-green color deficiency have difficulty identifying colors, making color comparisons, and recognizing objects of certain colors against their background. The lens, when fitted monocular to the non-dominant eye, improves all three tasks by introducing additional shades to the retina. The lens is available in prescription as well as Plano and will fit the pupil without compromising the color of the eye or visual acuity.
***For ZELTZER X-CHROM™ lenses, 6 mm is the standard diameter. Other pupil diameters are available.
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Answers to Common Questions About Color Blindness
A. Color blindness is the common name for color deficiency. Color deficiency is the condition in which the number of colors and shades seen by an individual is less than normal. There are various degrees of color deficiency, ranging from mild difficulty in recognizing a few colors to an inability to recognize any colors.
A. There are three visual color pigments in the cones of the retina, which are sensitive to red, green and blue. Each cone has a separate sensor so that different cones are stimulated by different wavelengths of light (colors). The cones react to the primary colors: red, green, and blue, and send messages to the brain which mixes them in appropriate proportions to provide normal color vision.
A. Yes. Most who are red-green color deficient are trichromats who have a weak reception for one of these colors, mainly green. Therefore, more than a normal amount of green in addition to red and blue is required by these individuals to produce all the colors known to them.
A. Red and green. In each of these cases, the person also finds other colors difficult to distinguish.
A. By recognizing some of the symptoms of color deficiency or taking a color-deficiency test. Color deficiency is not obvious. Dalton, who first described color blindness, did not recognize his color defect until age 26.
A. Color deficiency is suggested if a person's choice of color in ordinary life is often questioned by other people. Another symptom of color deficiency is a person's preference for blues and yellows as against reds or greens. A further suggestion of color deficiency is a person's difficulty in seeing veins or freckles. A color-deficient person is normally insensitive to fall foliage. Some color-deficient persons cannot distinguish black coffee from coffee with cream. Many have difficulty in recognizing the colored signals used in marine navigation, or on the highway. Also, the color of painted surfaces is easier to see than that of colored fabrics. School children may experience difficulty.
A. Eye practitioners are equipped to test the whole family for color deficiency.
A. Yes. In the United States alone, there are approximately 10,000,000 males and 600,000 females who are color deficient. Most of these persons may suspect but do not know they are color deficient. For a variety of reasons, they do not tell their friends or families.
A. The most accepted theory is that missing or defective nerve fibers in the cones of the retina cause color defects. However, the mechanism is not completely understood.
A. Not necessarily. It is an inherited, sex-linked characteristic. The female is the carrier. The female offspring of a color-deficient father will most likely transfer this genetic abnormality to half her sons. Some retinal injuries or diseases can also cause color deficiency.
A. A condition which some color-deficient persons appear to have; namely, a lack of interest in color.
A. Yes. In many instances, he may not see them at all; for example, strawberries in the field or ripe apples on a tree. When his color deficiency is aided, he can see such objects.
A. A color-deficient person may find it difficult to distinguish between red and green; between red, brown and gray; between green, brown and gray; between green, gray and certain blues; between red and black; and between light blue and purple. Also, he is often unable to distinguish between shades of the same color. Thus, he may confuse a cool yellow with a warm yellow. To a color-deficient person, pink can look insipid and even gray. Further, he might see a dull yellow as orange or light green. In many instances, the only colors that a color-deficient person commonly recognizes are blue and yellow. Further, pastel shades of all colors are difficult to distinguish.
A. Yes. Many occupations assume a person's ability to identify by color. This is true in the electronics industry, where color-coded components are a standard aspect of assembly. Color identification is also required in the fields of cosmetics, medicine, printing, agriculture, chemical analysis, textiles, plastics, photography, and art. There is practically no profession or trade that does not inherently use color as a means of identification.
A. It is a belief of those who have studied this problem that there is indeed some danger in having a colorblind person driving a vehicle. In some countries, it is difficult to get a driver's license. There are also restrictions against commercial driving by color-blind persons in many areas of the United States.
A. Yes. In marine navigation, aviation, and railroading, color signals are a vital part of the traffic-control system. A person who is color deficient has no way to identify these colored signals; this makes it extremely dangerous to permit him to navigate a boat plane or locomotive. In view of the great increase and complexity of colored signals and lights on highways, it can be hazardous for a color-deficient person to drive an automobile unless his color deficiency can be corrected.
A. Hunting is a sport in which there are approximately 2,300 accidental shootings each year. In the typical forest or underbrush, a color-deficient person could easily mistake a fellow hunter for the animal or bird being hunted.
A. Yes. The ZELTZER X-CHROM™ soft lens can help most color-deficient people.
Answers to Common Questions About the ZELTZER X-CHROM Soft Contact Lens
A. The lens is a special red contact lens that is worn on one eye only, preferably the non-dominant eye.
A. It increases the number of shades that a color-deficient person can see. Once these new shades have been properly identified, the color-deficient person can learn to recognize colors that he never knew existed. With greater use, his sensitivity to color increases.
A. The color-deficient person first fitted with a lens sees color as more "vibrant" than ever before. Many new colors stand out. These sensations soon become normalized and the person becomes accustomed to his greatly enlarged color discrimination.
A. No. It is fitted in the same manner as any other soft contact lens.
A. In some cases, it might slightly reduce visual acuity. In most cases, however, acuity remains unchanged. The lens should not be prescribed if visual acuity is less than 20/40.
A. With adaptation, there is no binocular interference.
A. No. It would cause annoying reflections and uncomfortable head motions. Also, intervening light that surrounds the filter would be distracting and the filter itself is cosmetically more objectionable. Light transmission control is more effective with a contact lens.
A. The lens can be worn during a person's waking hours, including day or night. However, some people cannot wear the lens during the night or in poor illumination. In general, the lens can be worn at work, play, or driving a motor vehicle. It is subject to other common restrictions of contact lenses such as removal before going to sleep.
A. Yes, providing a person can wear a contact lens and wishes to see a broader spectrum of color, age is not a factor.
A. The lens will not interfere with the regular use of contact lenses. It replaces one of those lenses for part of the time.
A. Yes. Approximately at the age of 12, when a youngster can take care of his possessions and assume responsibility, he can wear the lens. By wearing the lens at this early age he will avoid many of the learning problems and traumas that color-deficient children encounter in their education. The youngest child fitted to date is six years old.
A. The lens will not interfere with the regular use of contact lenses. It replaces one of those lenses for part of the time.
A. Yes. Approximately at the age of 12, when a youngster can take care of his possessions and assume responsibility, he can wear the lens. By wearing the lens at this early age he will avoid many of the learning problems and traumas that color-deficient children encounter in their education. The youngest child fitted to date is six years old.
A. Spectacles can be worn with the lens as long as the combination of the two gives the proper vision. Occasionally, a person using the lens will give up spectacles completely for contact lenses.
A. An uncorrected lens can be used by a color-deficient person who needs no eye correction.
A. When it is contraindicated and or the patient has poor binocular vision or ocular pathology.