Improvements in Spectacles or Eye-glasses.
Year: 1889

page_text: Improvements in Spectacles or Eye-glasses.
We, AUGUST MORCK, Jr., and FREDERICK MORCK, both of No. 24, Water Street,
Warren. Warren County, State of Pennsylvania, United States of America. Jewelers
and Opticians, do hereby declare the nature of this invention for "IMPROVEMENTS IN
SPECTACLES OR EYE-GLASSES," and in what manner the same is to be performed,"
to be particularly described and ascertained in and by the following statement:-
This invention relates to spectacles or eye-glasses, and it has for its object to improve
that type of spectacles or eye-glasses which is designed to enable the user to see at
close or distant range through the same pair of glasses.
Heretofore glasses for the purpose in question have been constructed in several
ways; for instance, with semi-lenses of different convexities with their line of junction
straight: with each glass made up of two half lenses of different powers-and with
single glasses, with a small portion of the surface ground thinner than the rest of the
glass, and sloping, for distant vision. In all of these constructions the prismatic effect
is liable to be, and often is, double-vision, besides producing in many persons who use
them blurred-vision and dizziness.
In this construction there are employed two lenses of different powers, of such
configurations and relative sizes as to avoid the objection of the eye resting at the same
time on both, lenses, and the consequent blurred or dizzy effect upon the vision.
In the accompanying drawing which forms a part of this description. Figure 1 is a
view in elevation of a pair of eye-glasses embodying the improvements, and Figure 2
is a plan view of the two members comprising the lens, said members being shown
separated.
Referring to the drawing, indicates the frames which hold the glasses and 4 the
connecting piece or bridge which joins the two frames, these parts being of the usual
construction.
The far vision lens is indicated by 5 and the near-vision lens by 6. The larger lens 5
is shaped essentially as shown in the drawing, with about one-fourth to one-third of
its lower surface cut out in such manner as to permit its lower edge at each side of the
semi-circular cut therein to extend to the bottom of the frame in which the glass is
secured. In Figure 2 the horizontal dotted line indicates the relative height to which
the smaller lens 6 extends, and 7 designates the spaces to the right and left of the
smaller lens which are integral parts of the larger lens,

page_text: The near-vision lens 6 is cui out of a separate piece of glass, and its edge of contact
with the larger lens 5, as well as the edge of contact of the larger lens itself, is square
and not sloping. The smaller lens is nicely adjusted to the opening in the larger
lens and is secured therein by any cement adapted for securing the edges of the two
lenses together, as for instance by diamond cement.
.
The lower edge of the smaller lens will be made to conform to the configuration of
the circumference of the larger lens as well as to that of the enclosing frame.
"
It is essential to the accomplishment of the purposes of my invention that the line of
juncture of the two lenses shall not extend horizontally or clean across the field of
vision, since if it should the eye could not avoid resting simultaneously, at times, on
both lenses and thus produce blurred vision. And this objection would exist even
where two segmental lenses are employed with a curved line of juncture extending
clean across the field of vision. Therefore, in the present instance, said line of
juncture is made to occupy a lower central position with relation to the larger lens,
thereby preserving free from obstruction that part of the compound lens employed for
the uses of far-vision. By lower central position is meant below the horizontal
axis of the larger lens and approximately central with reference to its vertical axis.
The above described construction overcomes the usual objections to glasses designed
for both near and far-vision-to wit, double and blurred vision, and consequent
dizziness, since the shape of the far-vision lens is such that the eye when directed to
that lens cannot, without special effort, be made to rest at the same time on the near-
vision lens. And while the near-vision lens is large enough for all practical purposes.
it is not large enough to render it liable to be employed or attempted to be employed
for far-vision; and the fact that the larger or far-vision lens extends to the lower rim
of the frame, upon each side of the smaller lens, enables the wearer of the glasses to
look down with ease toward the floor or ground through that lens, and without
liablity of having the vision blurred.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is
1. The combination with a far-vision lens having its lower edge cut out centrally in
semi-circular form, of a near-vision lens shaped to fit said central semi-circular opening
in the far-vision lens and secured therein by suitable adhesive substance, substantially
as set forth.
2. A far-vision lens having its lower edge cut out centrally in semi-circular form
and having the surface on both sides of the opening thus made extended to the lower
rim of the enclosing frame, in combination with a near-vision lens shaped to fit said
central semi-circular opening, substantially as set forth.
Dated this 11th love of Davarhan 1୧୯୧