Anti-slavery bugle. [volume] (New-Lisbon, Ohio) 1845-1861, 1857-03-07
THE USE AND CHOOSING OF sPECTA
Giles.

"In order that every person may be enabled to
Judge for themselves whether their sight may be
assisted or preserved by the use of spectacles. an
attentive consideration Ut The following rules will
be found sufficient
/. When we are obliged to removes small objects
to ~ considerable distance from the eye in order to
see them distinctly.
2. IL we find it necessary to get more light than
formerly; AZ, for instance, to ulace the light be-
tween the eye and the object.
3. Ii looking at, and nttentively considering a
near object it becomes confused, and appears to
have d kind Of mist before it.
i. When the letters Of u book :un one into the
other. and hence appear double or treble.
5. II the yes are 80 ~taligued 10y u little exercise
that We are obliged to shut them from time To
time, and relieve them 10y looking at other objects,
and especially dark ones.
When all tn ese circumstances occur, or any Of
them separately take place, it will be necessary to
seek assistance from glasses which will now ease
The eyes, and in some degree check their tendency
TO grow 1atter; whereas, if they be not assisted.
in time the latness will he considerably increased
by the effort the eyes are compelled to exert.
In every part OF the world lheIe are persons who
sell spectaUlns as part of their trade, who have
neither IL knowledge Of the anatomy Of the eye
nor the nature of optical glasses, SO that 1t is no
wonder So much injury is done. Thousands have
TO lament that ever they made use Of glasses"
The above is from the Augusta Chronicle and
Sentinel, communicated by an Uptician and is use
full information
The best method of selecting glasses by those
who require them is NOT given; II few words Of eau
ton ON this head would have been valuable; let us
add them:
When about to select n pair OF spectacles. let
Il Look Ut rather small but clear print he used, and
such glasses he chosen as will enable it 10 be read
at the same distance and with the same ease ms
before the yes were i'm paired.
This is the only sale rule. No person can sc.
lect Il pair Of spectacles for another. A pair that
will cause tie least pain or uneasiness To the Uye
in reading should ut once be rejected. Sumo deal
crs in spectacles recommend persons wishing IL
purchase to take glasses that are better lifted for
older persons, and Use the argument, they will
last longer" meaning thereby, that lecause the
wearer must grow older, they will serve him for a
greater number of years. The selection OF such
a pair Of spectacles will soon make The vision old
err. Ii is better to select II pair adapted Tor II per-
sun rather younger than one who 3 cider.
Another thing to he attended to IN looking Tor
spectacles is TO ascertain whether The eyes are
mates. 1t ~ not unusual to find an inequality i'll
the eyes of individuals. Matchmaker and en-.
grayers wh0 NE Il a magnify ing glass usually with
one eye, are frequently obliged to wear spectaclea
Sith Il glass Ot different focus for each eye. In
order to ascertain this, place the book at The dis
lance at which the print is seen clearly with both
eyes ut once; then, without moving the head or
The book, look with each eye alternately. If the
eyes be mates, the print will he seen equally well
with each. IL The eyes are alike, then prove the
gldsses Uf the spect.cles in the same way.
Having found the currect focus. observe if the
glasses Ge pure and free from scratches and veins,
or defects Of any kind. This can be done by
holding them from you towards Il lamp or the VIII.
dow, wher any such defect will he clearly seen.
The frames Or bows Of the spectacles should be
light and elastic; si'ye: and gold flames are the
best. They should 50 fiji on the face that the ella
OF eye ldshes will not touch the glasses: and they
should set straight Leiore the eyes, not down Oh
the muse.
The foregoing observation, may he sufficient to
enable persons in want Of spec,ucles to make u
correct chuice; but il will always he most sale to
make the purchase in person Of an experienced
optician.
Those who wish TO purchase colored glasses for
tender or diseased eyes, or TO wear in journeys,
ex posed To a hot sun on sandy plains, or in expos
ure to snow and bright sunshine, To protect tn,
eyes from excessive light, should select none bu
those OF u green color. Blue glasses are NOR,
mischievous than useful, because they absorb diff
e'n paris OF the sp, cIrum unequall, md transmit
} the extreme violet and blue rays. GIeen glasse
absorb the extreme violet and blue rays, and trans
init the red ray. producing a shorter spectrum an,
u mnre distinct image on the retina Of the eve. .
We have glasses Of various kinds, teles, opes
and microscopes, TO render objects mere diatinc
during Q faint light or in what is termed darkness