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W2051 Circular on Eyesight Testing
Jan 1 1850
To: Dr. Calvin Brooks McQuesten


And Preserve


It will be called for (if so ordered) by


Who will have with him at the same time a Large Assortment of His Justly Celebrated

For Sale

Examination of the Eye
With the Ophthalmoscope
[illustration caption]


Is your time of being suited on a scientific principle by Dr. Fox, with a pair of Tinted Focus Crystal Lenses, and save the trouble and cost incident to changing your glasses every year or two for the next ten or fifteen years.


Of the


Inventor of important improvements in spectacles. Late connected with Richter, the Imperial Optician of St .Petersburg, will call for your order and have with him at the time a large assortment of his


Which strengthen and invigorate the sight, for sale.

Whenever Fox's Improved Spectacles have been introduced they are spoken of in the highest praise (from their merits alone and practical experience of wearers.) In proof of the advantages derived from the use of these spectacles, they are used exclusively at all the eye infirmaries, hospitals, medical colleges and Universities, where they have been introduced. Dr. Fox certainly and always suits the patient's eyesight at once, and in every instance without fail.

A the first attempt,with the first pair of spectacles he selects, from an examination of the eye alone.

On scientific and Physiological principles, which have never failed to be correct, an ability acquired in an extensive practice extending over 20 years, which ability is seldom or every possessed by any other OCULIST or OPTICIAN. One pair of FOX'S improved spectacles as adjusted to the eye by himself, by his scientific method, suits equally well by artificial, as daylight, without a need of change to those of stronger, magnifying powers, from ten to fifteen years, and in cases of Nervous or Rheumatic conditions of vision (from their peculiar construction), they are an ease and comfort, and not as of the old kind, a pain to wear them.




It is well known by every one that excess of light is injurious to the sight; it has therefore been the endeavor of Opticians for years to produce a lense [sic] which would moderate the light, and have power to show minute objects plain to the wearer, but until of late all have failed to produce a lense which would stand the test.


Have been tested at Vienna and the Centennial Expositions and not only proved perfect, but were mentioned with great honors. The lenses are ground and polished by machinery, mathematically calculated to produce them, with their convexed or concaved surface, EXACTLY PARALLEL WITH EACH OTHER, thus rendering the focus the same through every part of their disc. The material out of which they are made is a TRANSPARENT SUBSTANCE OF GREAT DENSITY, lucidity and refractive power, making them the most perfect SINGLE ACHROMATIC LENS EXTANT. In using these spectacles, the eyes have free liberty of motion to range over and receive perfect sight through whatever points of the lenses they may be looking, THE FOCUS BEING MATHEMATICALLY THE SAME at every portion of their surface, and not as in the old kind, having only one point of focus, and that confined to the CENTRE OF THE SPECTACLE GLASS ALONE, thus compelling, when in use, a fixidity [sic] of the eyes, causing their muscles to be in a constant state of strain in order to keep the pupils opposite the centers of each lens IN ORDER TO SEE WELL, should the visual axis be directed away from the centers, the object is seen by OBLIQUE PRISMATIC LIGHT, consequently with uneasiness and not distinct; common sense must make it patent to every mind that being OBLIGED TO STEADY THE EYES in one fixed position for a considerable length of time, as in sewing, reading, writing, etc., that the muscles must become fatigued, the nerves irritated, so commonly complained of, which sooner or later, in susceptible cases, results in


How much more certain is this case, when the centers of the lenses in the spectacle frames (as is nearly always so) do not correspond with the centers of the eyes of the wearer. Now, the


Allow the eyes to look through any point of their disc, with a quietness and ease unparalleled in the history of spectacles, rendering what was formerly trouble and pain, a comfort and pleasure. NO STRAIN, NO FATIGUE, NO ACHE, no muscular exertion, no nervous excitement, but all is natural, easy and quiet, as there is an equal focus everywhere. When the improved spectacles are accurately adjusted to the eyes, they partially arrest or retard the ordinary decay of sight many years, suiting equally well by artificial lights of night as by daylight, from 10 to 15 yrs.


Understanding the peculiar physiological and morbid changes to which the human eye is subject, with all the remedial agents for its assistance or recovery, whether these be spectacles, medicines or hygienic measures.



It is not generally understood by those depending on artificial assistance to enjoy good vision, that it requires AS MUCH SKILL AND SCIENTIFIC KNOWLEDGE, to properly adapt a pair of spectacles, as it does to prescribe proper medicine, and that there is as much injury done to the eye from the use of improper medicines. A pair of spectacles should never be purchased from any person who is not thoroughly acquainted with the anatomy, physiology and disease of the human eye, laws of light, and the science of Optics. Yet it is strictly true, that a full knowledge of the above, combined with skill and experience, is absolutely necessary to CORRECTLY ADJUST TO THE EYE a pair of spectacles. The principle causes of optical defects of vision generally arise from decrease or access of refractive power in one, or more or all, of the transparent parts of the eye. In the presbyopic (or aged) eye, a magnifying lens is required. The myopic (or near-sighted) eye, a minifying lens. Now the great science of the Oculist or optician is THOROUGHLY TO UNDERSTAND THE AMOUNT of refractive power the eye has lost, or hAs in excess, so as to be able to select a pair of Lenses at once, at the first trial, that when tried by the patient shall prove to his satisfaction that they possess that amount of power the eye requires, NO MORE, NO LESS, or confidence ought not to be placed in his judgment. The usual method of persons wishing to supply themselves with spectacles is: They call at a deal's store, the proprietors of which places a number of spectacles upon the counter (of course, differing in degrees of magnifying power) from which the purchaser is to select. HE MAY just be accident, after trying a few pairs, take up a pair, and they may suit him as perfectly as if selected by the most competent Opticians; he sees well with then and places them aside from the rest. But not being sure of having the best pair amongst them, he endeavors to find others with which he can see still better! Spectacles after spectacles are tried, each sf [sic] different power, but with none can he see better than with the pair he laid aside. He tries that pair again, but is supposed to find he cannot see as well as when he tried them before. THE REASON WHY HE CANNOT IS PLAIN. The eyes possess the power for a moment of assuming the form necessary to see through any lens (at a certain distance from it) however improper it may be, and in the violent efforts it makes by endeavoring to see through the many tried on, has become nervously disturbed and excited, hence again cannot see through the spectacles that fitted the eye when it was undisturbed. The purchaser now, WITH EYES WEARIED AMD INFIT TO JUDGE of spectacles, tries a pair which seem to suit. These he buys, but soon discovers he cannot see with them as well as he expected. They make his eyes ache, and he remarks, “Why I could see beautifully with them at the store, and now I cannot” HE DOES NOT UNDERSTAND or take into consideration that his eyes have had time to recover form their excited condition by rest, and the spectacles that suited them in their distress, cannot suit them in their recovered state. He takes them back and goes through the same performance, until eventually becoming tired and out of patience of repeating the experiment (having no one of sound knowledge on the subject to advise with) he continues to wear the last pair he selected, thus forcing the sight to become (eventually) as DEFECTIVE AS THE POWER of such a lense requires it to be, in order to procure even ordinary eye-sight, and which spectacle sometimes in extreme nervous cases, CAUSE TOTAL BLINDNESS. The great difficult exists in finding an oculist or optician who really knows what kind of spectacles the eye actually requires, or the medicinal agents for the cure of its various diseases.


When we are obliged to hold small object further from or nearer to the eye, or try to obtain more light upon them than formerly, in order to see correctly; or if at minute employment, such as sewing, reading, writing, etc., the sight becomes dim, or small type of a book or newspaper on looking a short time (particularly by artificial lights) appears double, treble, indistinct or confused, with pain, ache or tiring of the eyes, or imagining we see small black, bright or colored spots floating before us, or clusters of threads, cobwebs, or other shapes and figures, or when the eyes are gradually losing their strength, shown by increasing dimness of vision; or when they are easily pained or dazzled by strong lights, such as are reflected from snow, water, vivid colored bodies, or the artificial lights of gas or lamps surrounding a speaker in public hall, or if the wind or cold makes eyes fill with tears, or if we occasionally see two or more objects where there is only one, or when we are obliged to rub or shut the eyes from time to time, look off from the work occasionally at other objects, before we can proceed with it. When any of the ABOCE SYMPTOMS OCCURE COLLECTIVELY OR INDIVIDUALLY, you ought to use spectacles, yet you had better apply to a professional man, who should be an optician, oculist and physician for advice respecting spectacles, as we have often weakness, dimness and other difficulties of vision, arising from some constitutional disturbances, perhaps located at some distant seat in the economy of he human system, exhibiting as one of its effects imperfection of sight, that can be frequently removed by Hygienic measures or medical agents. THE NUMBER OF CHILDREN AT SCHOOL SUGGERING in this way is immense. Being often abused for stupidity, both parents and teachers for a difficulty of vision, over which they have no control, and even obliged to wear spectacles, (sometimes) an exquisite torture advised by those who presume to know (when the article was really not needed). IT IS NOT UNCOMMON FOR CHILDREN TO REQUIRE OPTICAL AID in the form of spectacles at their studies; a remedy that when properly applies, only need to be worn long enough to remove the difficulty, as the eyes becomes as good as every, and the further use of the spectacles abandoned;-a circumstance rarely occurring in the aged, as their progress of sight is like their systems, on the way to decay, and dissolution, even this natural change of vision is much retarded by science by the admirable improvements in spectacles, and art in their proper adjustments.


There are instances where the eyes are compelled to labor, by working people, as much as 15 or 18 hours daily, at sewing, reading, writing, weaving, encraving [sic], embroidery, and other minute employments, by persons who are naturally of a weak constitution. Such people could not even use the large muscles of their body, engaged in walking or riding on horseback for that length of time, day after day, month after month, year after year, without injury or exhaustion-so with the human eye, it must under the circumstances of very work, have aid. This can be furnished by the OCCASIONAL USE OF THE RIGHT KIND OF PRESERVERS, or rests, in the form of spectacles. But when the sight is perfect and the labor light, combined with a healthy constitution, they are of no use, but productive of great harm. In fact, the idea of using spectacles to keep the eyes good because they are so, is about as sound in theory as was the man's who, because he was well, took physic to keep him so, and died.


Mr. Lewenberg,

My agent, who will present and collect this circular, is the only one authorized by me to receive orders which will always be attended by me personally. Anyone claiming to be my agent or selling in my name will be presented.

The price of my TINTED FOCUS CRYSTAL SPECTACLES (including their scientific adjustment to the sight) is $3.00 per pair.

N.B.-A large and selected stock of gold, silver, and skeleton frames constantly on hand.



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