SPECTACLES.

A vast amount of popular misapprehension and prejudice exists as to the

use of spectacles. Many persons who need them object to wearing them for

various reasons. Some fear that it will lead their friends to suspect that

they are getting old. Others think it will cause them to be suspected of

wishing to appear learned or cultured. Some persons do not want to begin

to wear them lest, having acquired the habit, they may not be able to

leave them off or to see well without them. Others again object to glasses

only on account of their inconvenience. I have personally met with many of

all these classes of persons, but I have frequently heard of another class

that I have never met with, namely, those who do not need glasses, but who

wear them just for effect and to attract attention. Now, the simple truth

is that there are just two good reasons for wearing spectacles, and only

two. One is that we may see better, the other is that our eyes may be

relieved of strain. Often both these reasons are combined in the same

case. Many children begin to be near-sighted after they have attended

school a few years. They first find it out by observing that they cannot

see letters or figures on the blackboard as far as the other children.

They can use their eyes as much as they want to without fatigue or

blurring, or smarting, or burning, or itching, or pain in the eyes, or

headache. In short, they show no symptoms of eye strain. They simply do

not see distant objects distinctly. Such children should be fitted with

glasses at once that will enable them to see as well as others at a

distance, and these glasses should be worn constantly. The child should be

instructed to take them off only when necessary to wipe them or to wipe or

bathe the eyes and on going to bed. The sooner the eyes get accustomed to

them the less likely is the near-sightedness to increase. Moreover, the

child who sees clearly only a few feet away from him loses a very

important part of his education. Our eyes gather information for us when

we are least thinking of it, by taking cognizance of the many objects that

come within our field of vision just as our ears gather material for the

proper development of our minds in listening to general conversation or to

the sounds of nature and of busy life about us. It is the duty of every

one to make the best possible use of the faculties the Creator has

bestowed upon him. The near-sighted person who does not have his vision

corrected by glasses fails in the performance of this duty.

[8] Continued from SUPPLEMENT, No. 647, page 10342.

From a paper by David Webster. M.D., professor of ophthalmology in the New

York Polyclinic and surgeon to the Manhattan Eye and Ear Hospital, New

York.

Again, the time comes in the life of every one who is not near-sighted,

and who lives to a good old age, when he cannot see near objects well

without glasses. Between the ages of 40 and 50, the crystalline lenses of

his eyes having hardened along with the other tissues of his body, he

finds it impossible to focalize as he used to. He holds his book farther

and farther away from his eyes, and finally he finds that he cannot read

fine print at all, or without straining his eyes. Then he must accept the

unpleasant fact that he is getting old-sighted, and if he wishes to use,

and not abuse, his eyes, he must get glasses to take the place of his lost

accommodation and with which he can read easily. Some persons who are

near-sighted in one eye and far-sighted in the other never need glasses,

but always do their reading and other near work with the near-sighted eye

and their distant seeing with the far-sighted eye. I believe I read a long

time ago, in an article by himself in the New York _Ledger_, that this was

the case with the late Rev. Henry Ward Beecher. But the vast majority of

persons who wear glasses, both for the distance and for the near, can see

quite as well without them. They do not wear them in order to be able to

see, but in order to have the strain removed from their eyes, and to be

relieved from the many disagreeable symptoms, both direct and reflex, that

result from eye strain.

Scientific American Supplement, No. 648, June 2, 1888. · 第 30 / 58 题