JPS6219169B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cross cylinder for lens selection, and more specifically, it is constructed so that it can be detachably attached to a trial frame, so that it is possible to easily adjust the degree of astigmatism, the astigmatic axis angle, etc. , and relates to a cross cylinder for lens selection that enables highly reliable measurements.

There are two types of cross cylinders: one is a built-in type, which is pre-installed in a precision instrument such as a subjective ophthalmoscope, and the other is a separate cylinder shaped like a magnifying glass, as shown in FIG.

This cross cylinder shaped like a magnifying glass 1
0 can be checked by holding it in front of the naked eye to check for astigmatism, or by incorporating various optometry lenses into the eyeglass frame (trial frame) and provisionally selecting the astigmatism power, astigmatic axis angle, etc. The magnifying glass-shaped cross cylinder 10 is held in front of the tentatively selected optometric lens, and various tests are performed to determine the optimal corrective lens.

However, since this magnifying glass-shaped cross cylinder 10 is used by hand-held and inverted in front of the naked eye or in front of a trial frame, the positioning when inverted or rotated is extremely unstable, and the astigmatic power, The measurement of the astigmatism axis, etc. is uncertain and lacks reliability, and the measurement values lack reproducibility, making it impossible to select the optimal corrective lens for astigmatism, etc.

The present invention has been made in view of the above-mentioned difficulties, and its purpose is to correct the astigmatism by attaching and detaching an optometric lens that enables easy and highly reliable measurement of the astigmatism axis, astigmatism power, etc. A pedestal ring formed to be removably attached to the lens attachment part of an ophthalmological trial frame for selecting lenses, and a cross cylinder lens rotatably supported on an appropriate support arm extending from the pedestal ring. We provide cross cylinders for lens selection.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below based on the accompanying drawings.

2 and 3 show a cross cylinder 20 according to the present invention.

Reference numeral 22 denotes a pedestal ring, the outer diameter of which is the same as the outer diameter of a normal optometric lens (not shown), and can be detachably attached to the lens attachment part of a trial frame, which will be described later. ing.

24 is a lens frame incorporating a cross cylinder lens 26, and reversing shafts 28 and 30 protruding outward in the diametrical direction are fitted and locked in grooves at the upper ends of support arms 32 and 34 erected on the pedestal ring 22. The reversing shafts 28 and 30 are rotatable.

Pressing springs 36 and 38 cover the grooves and have one end screwed to the upper ends of the support arms 32 and 34, respectively, and prevent the reversing shafts 28 and 30 from coming out of the grooves, and also prevent the reversing shafts 28 and 30 from coming out of the recessed grooves. By pressing a flat portion (not shown) formed at 30, the lens frame 24 is inverted and supported in a parallel position with respect to the pedestal ring 2.

Numerals 40 and 42 are knobs fixed to the tips of the reversing shafts 28 and 30.

It goes without saying that the reversal axes 28 and 30 are provided at an angle of 45 degrees with respect to the orthogonal axis of the cross cylinder lens 26.

Reference numeral 44 denotes a notch provided on the periphery of the pedestal ring 22 corresponding to the reversal axis 28, and a marked line 46 is marked at a portion exactly corresponding to the reversal axis 28.

48 is a notch provided on the peripheral edge of the pedestal ring 22 forming a circumferential angle of 45 degrees with the notch 44, and a marked line 50 is marked at a portion that exactly corresponds to one of the orthogonal lens axes of the cross cylinder lens. There is.

The notches 44 and 48 are designed so that when the cross cylinder 20 is attached to a trial frame (to be described later), a marked line indicating the direction of the axis of the astigmatism lens attached inside the cross cylinder 20 can be seen through the notches 44 and 48. This marked line and notches 44, 48
The marked lines 46 and 50 can be easily made to coincide with each other.

FIG. 5 is a perspective view showing an example of a trial frame.

The trial frame 60 has almost the shape of a normal eyeglass frame, and its lens holders 62 and 64 can be slid in the left and right directions relative to the upper frame 70 by operating PD adjustment knobs 66 and 68, respectively. It is set up freely.

The lens holders 62, 64 have knobs 72, 74.
Rotating rings 76 and 78 are equipped with rotating rings 76 and 78 that are rotated on the same plane as the lens holders 62 and 64, and lens mounting portions that lock lenses in three stages are provided on the respective peripheral edges of the rotating rings 76 and 78. is provided.

To explain this mounting part in detail, three stages of locking grooves into which the peripheral edge of the lens is fitted are provided, and locking protrusions 80a and 80 are provided upright at appropriate intervals.
b, and a pressing spring piece 82 whose one end is fixed to the locking protrusion 80a and whose other end press-fits and fixes the lens into the locking groove, so that the lens can be detachably fixed. .

Reference numeral 84 indicates an angle scale engraved on the lens holders 62, 64, and the astigmatism lens is attached so that the direction of the axis of the lens is aligned with this scale.

Note that 86 is an ear hook, 88 is an angle adjustment knob for the ear hook, 90 is a vertical knob for the nose rest 92, and 94 is a front/backward knob for the nose rest.

The cross cylinder 20 according to the present invention is configured as described above.

Since the pedestal ring 22 is formed to have the same diameter as a normal optometry lens, the cross cylinder 20 can be detachably mounted on the lens mounting portion of the trial frame 60 in the same way as a normal lens.

To explain the case of selecting an astigmatic lens using the cross cylinder 20 according to the present invention, first, various optometry lenses are placed in the trial frame 60.
The power and astigmatism axis of the lens for astigmatism are determined using an astigmatism table or the like in the usual manner, and the angle scale 84 of the lens frame 62, 64 equal to this astigmatism axis angle is attached to the lens attachment portion of the rotating rings 76, 78. Align the mark line indicating the lens axis of the astigmatism lens with the position.

Next, the cross cylinder 20 is attached to the rotating rings 76 and 78 so that the marked line 50 of the notch 48 provided corresponding to one of the orthogonal lens axes coincides with the marked line indicating the axial direction of the astigmatism lens. The power of the astigmatism lens is determined by a known method by having the examinee read the cross cylinder lens 26 while inverting it and replacing the cross cylinder as appropriate.

Next, the cross cylinder 20 is attached to the rotating rings 76, 78 so that the marked line 46 of the notch 44 provided at a position corresponding to the inversion axis matches the marked line indicating the axial direction of the astigmatism lens.

Then, the astigmatism axis can be determined by a known method by rotating the cross cylinder 20 in a predetermined direction from the above position while inverting the cross cylinder lens 26 and having the examinee read it. In this case, the astigmatic lens and the cross cylinder 20 are connected to the rotating rings 76, 78.
Since they rotate together, there is no need to align the marked lines one by one.

In the above embodiment, the cross cylinder 2
0 marking lines 46 and 50 are provided in the notches 44 and 48, but it is not necessarily necessary to provide the notches. For example, the pedestal ring 22 may be formed of a transparent synthetic resin, and the pedestal ring 22 may be formed at a predetermined position on the pedestal ring 22. A marked line may also be provided.

Furthermore, the marked line itself does not necessarily need to be provided.

It goes without saying that the cross cylinder 20 can be used not only for selecting an astigmatic lens as described above, but also for various types of normal eye examinations. Further, the outer diameter of the pedestal ring of the cross cylinder does not necessarily need to be formed to be the same diameter as the lens outer diameter, but may be formed arbitrarily, and a mounting portion exclusively for this pedestal ring may be provided.

As described above, according to the present invention, since the cross cylinder is removably attached to the trial frame, it is not only easier to handle than the conventional cross cylinder shaped like a magnifying glass, which is manually reversed. Allows for reproducible and highly reliable measurements.

Furthermore, since the marking section indicating the lens axis orthogonal to the cross cylinder inversion axis can be easily aligned with the marking line indicating the lens axis of the astigmatism lens,
This has the remarkable effect of making measurement operations even easier.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a magnifying glass-shaped cross cylinder, FIG. 2 is a plan view showing an example of the cross cylinder according to the present invention, and FIG. 3 is a left side view thereof. FIG. 4 is an explanatory view showing a cutout of the pedestal ring of the cross cylinder, and FIG. 5 is a perspective view showing the trial frame. 10, 20... Cross cylinder, 22... Pedestal ring, 24... Lens frame, 26... Cross cylinder lens, 28, 30... Inversion axis, 32,
34... Support arm, 36, 38... Pressing spring, 4
0,42...Knob, 44,48...Notch, 4
6, 50... mark line, 60... trial frame, 62, 64... lens holder, 66, 68
...PD adjustment knob, 70...Top frame, 72, 74
...Knob, 76, 78 ... Rotating ring, 80a,
80b... Locking protrusion, 82... Pressing spring piece, 84
... Angle scale, 86 ... Ear hook, 88 ... Angle adjustment knob, 90 ... Vertical movement knob, 92 ... Nose rest, 9
4... Back and forth movement knob.

Claims (1)

[Claims] 1. A pedestal ring formed to be removably attached to the lens attachment part of an ophthalmological trial frame for removably attaching optometric lenses and selecting corrective lenses, and a suitable support extending from the pedestal ring. A cross cylinder for lens selection consisting of a cross cylinder lens rotatably supported on the arm.