JPS6323051Y2 - - Google Patents

Description

[Detailed description of the invention] In this invention, an opaque inspection lens holder 2 is placed inside a spectacle frame 1, and a spring 3 provided on the upper part of the holder 2 is inserted into the downward groove 4 of the frame 1. The lower end of the eyeglass temple 6 is slidably engaged in the upward groove 5 of the frame 1 in the lateral direction, and the base of the temple 6 is slightly bendable about an axis 8 orthogonal to the temple connection axis 7. The present invention relates to a device and aims to provide a device that can easily test near visual acuity using bifocal glasses.

As shown in FIG. 2, the near lens opaque holder 2 for testing is made by fitting a small near lens 11 (contact lens, etc.) for testing into a through hole 10 bored at the bottom or middle of an opaque plate 9, One end 3' of 3 is fixed to the same plate 9, the other end 3'' is a free end, and the middle part is curved to the upper part of the same plate 9. The base of the temple 6 is connected to the frame 1 by a vertical connecting shaft 7.
The frame 1 can be rotated slightly downward from the position shown in FIG. 3 to the position shown in FIG. 4 around an orthogonal shaft 8 provided at the base. It is self-retained by the force of the spring in the rotated position, and can be manually returned to the original normal position shown in FIG. 3, and that position is also self-retained by the force of the spring. 12 in the figure
The one shown with is the orthogonal shaft 8 provided on the inner surface of the base of the temple 6.
and housing for self-retention springs and other things, 13 is a nosepiece,
14 is a support shaft of the nose rest 13.

Therefore, after sliding the holder 2 laterally to align the testing near lens 11 with the eye 15, the holder 2 is placed inside one frame 1 as shown in FIG. Opaque plate 16 inside frame 1
and insert the same holder 2 into the vertical grooves 4 and 5.
and the spring 3, which is hung on the face as shown in FIG. 3, and the near vision chart 17 shown in FIG.
When viewed through the inspection near lens 11, the field of view within the range of imaginary line a in FIG. 7 (5 cm to 15 cm frame) can be seen. Next, when the frame 1 is tilted slightly downward about the orthogonal axis 8 as shown in the imaginary line in FIG. 1 and in FIG. It can be seen in the 5cm to 30cm frame of the near visual acuity chart 17. When this visual acuity chart 17 is placed horizontally on a desk, 5 cm to 30 cm frames are drawn in sequence according to the distance from the eyes 15, and the font sizes are arranged in order from large to small.

Conventional near visual acuity testing devices test visual acuity by placing a visual acuity chart with large and small letters at the clear viewing distance from the eyes, which makes it inaccurate to determine the position of the near lens relative to the frame of the bifocal lens. It has been difficult to test near vision in the normal position (relative position between the eye and the near lens).

This proposal was made in view of the above circumstances, and
Since the present invention is constructed as described above, in a near visual acuity test using bifocal glasses, it is not only easy to replace the holder 2 while wearing the glasses, but also easy to attach an appropriate near lens to the frame 1 of the glasses. In the mounted state, the frame 1 can be tilted slightly from the orthogonal axis 8, which has the advantage of enlarging the field of view of the near vision lens 11 for inspection and easily determining the appropriate near vision lens at the appropriate position of the frame 1 in that state.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the visual acuity test device of the present invention, Fig. 2 is a front view of the opaque test lens holder,
Figures 3 and 4 are side views of bifocal glasses in use, Figure 5 is a front view of the relationship between the eyes and the near lenses in Figure 3, and Figure 6 is the relationship between the eyes and the near lenses in Figure 4. FIG. 7 is a front view and a plan view of a near visual acuity chart. 1... Glasses frame, 2... Near vision lens opaque holder for inspection, 3... Spring, 4... Downward groove, 5...
...Upward groove, 6...Spectacle temple, 7...Connection shaft, 8...
...Orthogonal axis.

Claims (1)

[Scope of utility model registration request] A near vision lens opaque holder 2 for examination is arranged inside the spectacle frame 1, and the spring 3 provided on the upper part of the holder 2 is inserted into the downward groove 4 of the frame 1, and the lower end of the holder 2 is inserted into the downward groove 4 of the frame 1. A visual acuity testing device which is slidably engaged in the upward groove 5 in the lateral direction and in which the base of the temple 6 is slightly bendable about an axis 8 orthogonal to the temple connection axis 7.