The times. (Owosso, Mich.) 1882-1897, 1888-05-04


sPECTrvE SPECTACLE WEARING PUBLIC
BY THE JOHNSTON OPTICAL CO.,
OF DETROIT, MICHIGAN
Why do so many complain of galsses no;
exactly suited 10 their. vision? If your
eyes are normal, perhaps you don't care.
But you will you live. You are drifting
toward the use of spectacles by law as
inexoi able a. the grave. The following
five points explain:
/. Nearly all eyes, to some extent,
Astigmatic; the majority slightly, but
many seriously so. Such an eye, unlike a
normal one. is not equally convex on all
sides, being cylindrical in shape. Only a
lens whose surface is correspondingly
cylindrical will fit il. AS spherical lenses
asst, in measure. in many cases needing
cylindrcals and rs the latter are little
known or appreciated, few deal rs are
prepared To- fit eyes that require them.
Many, therefore, are hlted imperfectly,
and so injuriOusly. After much effort and
expense, the evil remedied by the Johnston
Optical Co., of Detroit, Mich, who have
invented an unrivaled instrument, patented
by them under the name of the Doplric
Eye Meter, which fits all kinds and cum-
binatlons of Astlgmalism, Myopia, Hyper
metrophia. Presby opia, &c.
2. Astigmalic or cylindrical eyes differ
greatly. The cylindrical axis is found at
different angles. To determine the angle
in each case. some apparatus or insiru
ment Is absolutely necessary The Eye
Meter supplies this necessity. Without its
aid the cylindrical eye is sure 10 be
misfitted
3 Eyes often seem fitted when they are
not. One may be cyl ndrical and the other
spherical Then the latter gels fitted and
SO does all the work. Or, both may be
spherical, but one stronger than the other,
and then 1t alone is apt to receive the fit.
Passable sight being secured with single
eye, The patient is unconscious that his
other eye is failing tn perform It's function,
besides being injured by its abnormalty
and misfit The Eye-Meter exposes this
ignorance and fits each eye separately.
4. The most comm n cas-, calling for
optical treatment are defects in spherical
eyes, which. like cylindrical eyes, need the
test of The instrument. 1t is SO easy to
crafty the patient with a lens which gives
apparent help and yet does HARM that the
temptation Is strong TO make the Test so
partial and superficial as not TO discover
the more serious and infrequent defects
Thus, fifty per cent perhaps are imperfect
ly fitted, and large percentage of Myopic,
Hypermetropic and Presbyopic. to say
nothing of Asligmatic cases, are never
fitted at all, especially among school
children and students. The patient often
has himself TO blame for not securing
thorough examination of his eyes, TO learn
whether they are defective or not FIRE.
quently the muscles continue vigorous
enough for a while, to correct in part, by
severe exertiOn, any malfOrmatiOn of the
eye, and thus conceal the necessity OF
spectacles, But ultimately this unnatural
strain leads tor their collapse and perhaps
paralysis and ruin. BY good right every
eye should be examined. The prejudice
that it is better to postpone the use of
glasses as long as possible, is an absurd
unscientitic superstition. Properly fitted
spectacles preserve the sight. The use of
the Eye Meter insures thorough test
8. Occasionally an eye has both spher-
zeal and cylindrical defects, and requires
compound lens. combining the cylindrical
with the spherical form. The Eye-Meter
tesis for such lens in manner most
ingenius and accurate, n feature which |
alone has secured for il the sanction and
encomiums of Eye Infrmaries and Oculists
of the highest authority In the country. |
Cylindrical lenses must be ground to order, |
no two cases being identical Impossible |
as IL thus is to keep them in stock. IL is |
equally impossible to test eyes needing
them, without the aid of the Eye-Meier
But with IL and the instructions for its use.
one becomes skiIlful optician.
N. NJ. PRAY,