A remote-controlled LCD sight-testing instrument which includes a mainframe and a remote controller, the mainframe having a display module, the display module being controlled by a control switch of the remote controller to show different test patterns for testing the user's visual acuity, the remote controller having a plurality of direction buttons through which the user gives an answer to every test pattern shown on the display module, the mainframe further having a visual acuity display unit controlled to indicate the user's visual acuity by digital and alphabet, and a buzzer controlled to give a particular sound after test of every test pattern subject to the test result.

BACKGROUND OF THE INVENTION 
The present invention relates to an instrument for testing eyesight, and 
more particularly to a remote-controlled LCD sight-testing instrument 
which is remote-controlled to show different test patterns for testing the 
user's visual acuity, and to indicate test result by digital. 
In the ophthalmologic department of a hospital or an eye clinic, there is 
provided a sight-testing chart and illuminated by a light source for 
testing eyesight. This sight-testing chart has a plurality of test 
patterns of different sizes marked on it. The test patterns show a 
respective gap in different directions. The eye patient is requested to 
point out the direction of the gap at the assigned test pattern. This 
eyesight testing method has drawbacks as outlined hereinafter. 
1. Because the test patterns are aligned longitudinally as well as 
transversely, the directions of the gaps at the test patterns can easily 
be memorized after several tests. 
2. This eyesight testing method must be performed under the guide of the 
examiner, i.e., the eye patient cannot make a test accurately by oneself. 
3. Because the sight-testing chart is hung on the wall, it tends to be 
covered with dust and dirt. 
4. Because a big number of test patterns of different sizes are aligned 
transversely as well as longitudinally on the front side of the 
sight-testing chart, the size of the sight-testing chart cannot be 
minimized without affecting test accuracy. 
SUMMARY OF THE INVENTION 
The present invention has been accomplished to provide a remote-controlled 
LCD sight-testing instrument which eliminates the aforesaid drawbacks. It 
is one object of the present invention to provide a remote-controlled LCD 
sight-testing instrument which is remote-controlled by the eye patient to 
achieve the test. It is another object of the present invention to provide 
a remote-controlled LCD sight-testing instrument which enables the user to 
complete the test by oneself without the assistance of another person. It 
is still another object of the present invention to provide a 
remote-controlled LCD sight-testing instrument which has an attractive 
outer appearance, and is easy to clean. It is still another object of the 
present invention to provide a remote-controlled LCD sight-testing 
instrument which is compact and portable, and needs less installation 
space. To achieve these and other objects of the present invention, there 
is provided a remote-controlled LCD sight-testing instrument which 
comprises a mainframe and a remote controller. The mainframe comprises an 
infrared receiver, a micro controller, and a display module. The display 
module comprises a plurality of annular display areas concentrically 
arranged at a front display face thereof and respectively divided into a 
plurality of display units. The display units are respectively driven by 
the micro controller subject to the nature of the infrared signal received 
by the infrared receiver, to show "on" or "off" status, causing a test 
pattern to be shown on the front display face of the display module. The 
remote controller comprises an infrared emitter, a control switch, and a 
plurality of direction buttons. The control switch is operated by the user 
to control the micro controller through the infrared emitter and the 
infrared receiver, causing the micro controller to drive the display 
module in showing a test pattern for testing the user's visual acuity. The 
direction buttons are operated by the user to give an answering signal to 
the micro controller through the infrared emitter and the infrared 
receiver. Test result is shown by digital or alphabet through a counter 
and a visual acuity display.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIGS. 1 and 2, a remote-controlled LCD sight-testing 
instrument in accordance with the present invention is generally comprised 
of a mainframe 10, and a flat LCD module 20. The mainframe 10 comprises an 
infrared receiver 21, a micro controller 23, a LCD driver 25, and a buzzer 
27. The LCD module 20 comprises a visual acuity display unit 11 for 
indicating the degree of the eye patient's visual acuity by alphabet, a 
pattern display unit 13 for showing a test result pattern, and a counter 
15 for indicating the eye patient's visual acuity by digital. The LCD 
module 20 has a plurality of annular liquid crystal display areas 
concentrically arranged at its front side, and respectively divided into a 
plurality of display units. Alternatively, the light emitting diodes can 
be arranged at the front side of the LCD module 20 instead of annular 
liquid crystal display areas. The display units of the LCD module 20 are 
respectively controlled by the micro controller 23 to show "on" or "off" 
status. Therefore, particular display units of the LCD module 20 can be 
turned to "on" status to show a test pattern "C" on the front side of the 
LCD module 20. 
Referring to FIG. 3, a remote controller 30 comprises an infrared emitter 
33, a plurality of direction buttons 31, a control switch 37, and an 
indicator light 35. The infrared emitter 33 is controlled by the control 
switch 37 and the direction buttons 31 to emit a respective infrared 
signal to the infrared receiver 21. When the infrared receiver 21 receives 
an infrared signal from the remote controller 30, it immediately transmits 
the signal to the micro controller 23 for processing. The direction 
buttons 31 are for the eye patient to give an answer to each test pattern 
shown on the LCD module 20. 
Referring to FIGS. 4 and 5 and FIG. 3 again, when the control switch 37 is 
switched on, the mainframe 10 is at the stand-by status, and the LCD 
driver 25 is controlled by the micro controller 23 of the mainframe 10 to 
drive the LCD module 20, causing it to show randomly a set of test 
patterns one after another at a predetermined interval. When a test 
pattern is shown on the LCD module 20, the eye patient is requested to 
give an answer by controlling the corresponding direction button 31. If 
the correct direction button 31 is clicked, the micro controller 23 
immediately drives the buzzer 27 to produce a particular sound, and then 
drives the LCD module 20 to change the test pattern. If a wrong direction 
button 31 is clicked, the micro controller 23 drives the buzzer 27 to 
produce another sound, and then drives the LCD module 20 to change the 
test pattern. If a plurality of wrong answers are continuously appeared, 
the micro controller 23 stops the test, and drives the visual acuity 
display unit 11 to indicate the degree of the eye patient's visual acuity 
by alphabet, the pattern display unit 13 to show a particular test result 
pattern for example a crying face, and the counter 15 to indicate the 
degree of the eye patient's visual acuity by digital. 
While only one embodiment of the present invention has been shown and 
described, it will be understood that various modifications and changes 
could be made thereunto without departing from the spirit and scope of the 
invention disclosed.