The Abbeville banner. [volume] (Abbeville, S.C.) 1847-1869, 1857-03-19
THE USE AND oHoosfNa or spRcTXioJIEs

abled 10 judge forthemselves whether thei
sight 8lnay. be assisted or preserved by
the OF spectaeles, an attentive consd
q 3 eration of the following rules will be found
!, suflicieut:-
/. When we are obligcd to remove small
objects to considerable distance from the
eye in order to see them distinctly.
2. If we find it necessary to get more
light chan formerly; as, for instance, to
place the light between the eye and the OBJ
jeet.
3. Ii looking at, and attentively consid.
cring - near Object it becomes confused
and appears To have kind of mist before
$as4. When the letters Of book run one
into the other, and hence appear double o,
treble.
- 8. If tl,e'cycs are SO fatigued by a little
exercise that we are obliged to shut them
from time to time, and relieve them by
looking at other Objects, aud especially dalk
ones.
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
tatness will be considerably increased by
the effort the eyes are compelled to exert.
$ In every part of the world there are
persons who sell spectaclcs rs part of their
trade, who have neither knowledge of
the anatomy Of the eye nor the nature of
optical glasses, so that it 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 optician,
and is useful information.
The best method of selecting glasses by
those who require them is not given a
few words Of caution on this head would
: have been valuable let us add them:
When about to select a pair of specta-
cles, let book Of rather small but clear
print be used, and such glusscs be chosen
as will enable it to be read at the same dis
eyes were impaired.
This is the only safe rule. No person
can select pair Of spectacles for another.
A pair that will cause the least pain or un-
easiness to the eye in reading should at
once be rejected. Some dealers in specta-
cles recommend persons w;sLing to purchase,
to take glasses that are better fitted for
older persons, and use the argument. they
will last longer, meaning thereby, that be-
cause the wearer must grow older, they
will serve him for a greater number Of years.
The selection Of such pair Of spectacles
will soon make the vision older. 1t is bet
ter to select pair adapted for a person
rather younger than one who is older.
Another thing to he attended 10 in look.
ing for spectacIcs is to ascertain whether
the eyes are mates. 1t is not unusual to
find an inequality in the eyes of individuals
Watchmakcrs and engravers who use
magnifying glass usually with one eye are
frequently obliged to wear spectaclcs with
glass OF different focus for each eye. In
order to ascertain this, place the book at
the distance at which the print is seen
clearly with botl, eyes at once; then, with
out moving the head or the book, look with
each eye alternately. If the eyes be mates,
the print will be sen equally we'll with each
If tile eyes are alike, then prove the glasses
of the spectacles in the same way.
Having found the correct focus, observe
ifthe glasses be pure and free from scratches
and veins, or defects of any kind. This
can be done 10y holding them from you to-
wards lamp or the window, when any
such defect will be clearly seen.
The frames or bows Of tile spectacles
should be light and elastic; silver and gold
frames are the best. They should so fit on
the face that the ella or eye lashes will not
touch the gasses and they should set
straight before the eyes, not down on tile
nose.
The foregoing observation, may be suffi-
cient to enable persons in want of spectacles
to make correct choice; but it will always
be most safe to make the purchase in per-
son of an experienced optician.
Those who wish to purchase colored
glasses for tender or diseased eyes, or to
wear in journeys, exposed to hot sun
on sandy plains, or in exposure to snow
and bright sunshine, to protect the eyes
from, excessive light, should select none but
those Of green color. Blue glasses are
more mIscliieyous than useful, because they
absorb different parts of the spectrum un-
equally, and transmit the extreme violet
and blue rays. Green glasses absorb the
extreme violet and. blue rays, and transmit