JPH0614905U - Prescription aid for toric contact lenses - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a prescription aid for a toric contact lens that can easily measure the tilt angle of the guide mark of the toric contact lens. [Structure] An auxiliary tool 1 of the present invention comprises a disk-shaped main body 2 made of a transparent material, a knob 3 provided on the outer periphery of the main body 2,
It is composed of a reference line 5 displayed over the center line 4 of the main body 2 and scales 6 centered on the reference line 5 and provided on the left and right sides thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a prescription aid for a toric contact lens (hereinafter referred to as TCL). More specifically, the present invention relates to a prescription assisting tool (hereinafter, simply referred to as an assisting tool) for measuring a guide mark of TCL for determining an astigmatic axis of TCL to be prescribed.

[0002]

[Prior art]

 The TCL is a contact lens for correcting astigmatism, and has different curvatures in the radial direction of two orthogonal inner and / or outer surfaces thereof, and has different refractive power as a lens. Of course, the lens is required to stabilize in a predetermined position without rotating when it is worn, so it has been creatively designed in terms of shape. Among them, as shown in FIG. 3, a prism ballast design has been conventionally used to shift the center axis of the inner surface and the center axis of the outer surface from each other so that the lens does not rotate on the cornea after wearing the TCL. Design) is often adopted. In the case of this TCL21, a guide mark 22 indicating the base direction of the prism is generally provided, and when a lens is worn, this guide mark is usually present below (clockwise at 6 o'clock). It should be done.

[0003]

[Problems to be solved by the device]

 However, the TCL 21 may not rotate to a predetermined position due to the shape of the eyelid and the guide mark 22 may be present at a position inclined from below. In that case, it is necessary to measure the presence or absence of the tilt of the TCL 21 and the angle thereof (that is, the tilt angle of the guide mark 22) in advance before and after the power correction and the axis correction of the TCL 21. Conventionally, there was no means for quantitatively measuring the tilt angle of TCL to determine the astigmatic axis of TCL, so an ophthalmologist can visually observe the worn TCL with a slit lamp microscope and guide it visually. The angle of inclination of the mark was judged. Therefore, there is a problem that the measurement accuracy is limited and the measurement is time-consuming.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an auxiliary tool that can easily measure the tilt angle of the guide mark of the TCL.

[0005]

[Means for Solving the Problems]

 The auxiliary tool of the present invention comprises a disk-shaped main body made of a transparent material, a knob provided on the outer periphery of the main body, a reference line marked on the center line of the main body, and a reference line on the left and right of the reference line. It is characterized in that it is provided with a scale for displaying an angle.

Further, it is preferable that the angle display graduations are provided symmetrically with respect to the reference line in the left and right directions within a range of at least 30 degrees.

Further, the assisting tool of the present invention comprises the assisting tool for the left eye and the assisting tool for the right eye having different knobs.

[0008]

[Action]

 When measuring the tilt angle of the guide mark of TCL using the assisting tool of the present invention, first attach the assisting tool to the optometry frame, and then match the guide mark on the TCL with the reference line of the assisting tool. . Then, the inclination angle of the guide mark is measured from the mark on the optometry frame and the display of the angle display scale of the auxiliary tool. In this way, the tilt angle can be read immediately, so it is possible to easily measure with a simple operation.

In addition, the aid for both eyes eliminates the inconvenience of putting it in and out of the optometry frame during use.

[0010]

【Example】

 Next, the auxiliary tool of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the assisting tool of the present invention, and FIG. 2 is a partially omitted perspective view showing a state in which the assisting tool of FIG. 1 is mounted on an optometry frame.

As shown in FIG. 1, the auxiliary tool 1 of the present invention has a main body 2 made of a disc-shaped transparent material. A knob 3 is provided on the outer periphery of the main body 2 so as to project. A reference line 5 is marked on the center line 4 of the main body 2, and angle scales (hereinafter referred to as scales) 6 around the reference line 5 at both ends of the reference line 5 are centered on the reference line 5 respectively. Are symmetrically applied.

In the present embodiment, the reference line 5 is displayed so as to extend over the entire center line 4 of the main body 2, but the present invention is not particularly limited to this and may be displayed only at both ends of the center line 4. .

The scales 6 are provided on the left and right sides of the reference line 5 at intervals of 5 degrees within a range of 30 degrees. The scale 6 shown in FIG. 1 displays the clockwise direction as negative and the counterclockwise direction as positive. However, the present invention is not limited to this, and the scale 6 may be provided with the positive and negative directions reversed. Also, the division of the scale 6 is not limited to every 5 °.

The assisting tool 1 of the present embodiment comprises a pair of assisting tools for the right eye and the left eye. The auxiliary device 1a for the right eye and the auxiliary device 1b for the left eye have the same configuration except for the position and display of the knob 3.

It is preferable that the auxiliary tool 1 has a size suitable for a ready-made optometry frame. For example, the main body 2 is preferably formed with a diameter of 30 to 40 mm and a thickness of 1 to 4 mm.

Next, an example of a method of measuring the inclination angle of the guide mark (22 in FIG. 3) of the TCL using the auxiliary tool 1 will be described.

As shown in FIG. 2, first, auxiliary tools 1a and 1b are mounted in annular covers 9a and 9b provided on the left and right annular portions 8a and 8b of the optometry frame 7, respectively. Then, wear TCL (a lens for standard determination may be used). Then, the auxiliary tool 1 is set so that the 0 ° direction (direction indicated by the reference line 5) and the marks 7a, 7b indicating the vertical direction of the optometry frame 7 (clockwise 6-12 o'clock direction) match. Next, the slit width of the slit lamp microscope is made extremely thin, and the slit light is present in the guide at approximately the lower part of the TCL (TCL does not always exist in the 6 o'clock direction of the clock by rotating in the eye). Rotate to match the mark and stop. Then, the focus is moved to the auxiliary tool 1 while maintaining the angle of the slit light of the slit lamp microscope. Finally, the assisting tool 1 is rotated so that the slit light and the 0 ° direction (reference line 5) of the assisting tool 1 are aligned, and the tilt angle of the assisting tool 1 at the time of matching is marked as the tilt angle of the guide mark. Measure and record the angle displayed on the scale 6 corresponding to 7a and 7b. In this way, the presence or absence of the inclination of the guide mark attached to the TCL and its angle can be easily measured by a simple operation.

After measuring the tilt angle, the power of the lens is corrected, and finally the TCL standard is determined based on the tilt angle of the guide mark and the inspection value of the power correction of the lens. If the guide mark is tilted, it is necessary to adjust the astigmatic axis to determine the final TCL standard. For example, when the guide mark is tilted in the clockwise direction, the tilted angle (positive) is added to the astigmatism axis for power correction to obtain the final astigmatism axis of TCL. In addition, if the guide mark is tilted counterclockwise, the tilted angle (negative) may be added to the astigmatic axis for power correction to make it the final astigmatic axis of the lens.

Further, the assisting device of the present invention can be used as a device for finely adjusting the inclination of the astigmatic axis of the TCL at the time of regular examination of the eye.

[0021]

[Effect of device]

 By using the prescription aid of the present invention, the inclination angle of the guide mark of the TCL can be easily measured, so that the prescription of the TCL becomes easy.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an auxiliary tool of the present invention.

FIG. 2 is a partially omitted perspective view showing a state in which the auxiliary tool of FIG. 1 is attached to an optometry frame.

FIG. 3 is a partially cutaway perspective view for explaining a toric contact lens.

[Explanation of symbols]

 1 Auxiliary tool 2 Main body 3 Knob 4 Center line 5 Reference line 6 Scale

Claims (3)

[Scope of utility model registration request] 1. A disc-shaped main body made of a transparent material, a knob provided on the outer periphery of the main body, a reference line marked on the center line of the main body, and a reference line on the left and right of the reference line. A prescription aid for toric contact lenses consisting of a scale for displaying angles. 2. The prescription aid according to claim 1, wherein the angle display scale is provided symmetrically to the left and right with respect to the reference line within a range of at least 30 degrees. 3. A prescription aid according to claim 1 for the left eye,
A prescription aid for a toric contact lens for both eyes, comprising the prescription aid for the right eye having a knob different from that of the prescription aid for the left eye.