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Ishihara Test 38 Plates.pdf NEW!


Ishihara Test 38 Plates.pdf: A Comprehensive Guide




If you want to check your color vision or diagnose a color vision deficiency, you may have heard of the Ishihara test. This is a widely used test that consists of a set of 38 colored dotted plates (called Ishihara plates) that either contain a number or a path-shaped design. The Ishihara test can help you identify if you have a red-green color blindness, which is the most common form of color vision disorder.




Ishihara Test 38 Plates.pdf



What is the Ishihara test and how does it work?




The Ishihara test was created by Dr. Shinobu Ishihara, a Japanese ophthalmologist, almost 100 years ago. He designed the plates based on the principle that people with normal color vision can see certain colors more clearly than people with red-green color blindness. The plates have different patterns of colored dots that form numbers or shapes that are visible to people with normal color vision, but not to people with red-green color blindness.


The Ishihara test is usually performed by an eye doctor or a trained professional. You will be asked to look at each plate and say what number or shape you see, or if you see nothing at all. The test can be done with or without glasses or contact lenses. The plates should be viewed in good lighting conditions and at a distance of about 75 cm (30 inches) from your eyes. The test usually takes about 10 minutes to complete.


What are the types and results of the Ishihara test?




The Ishihara test can detect two types of red-green color blindness: protan and deutan. Protan color blindness affects the perception of red colors, while deutan color blindness affects the perception of green colors. Both types can be complete (protanopia or deuteranopia) or partial (protanomaly or deuteranomaly).


The results of the Ishihara test are based on how many plates you can see correctly. If you can see all 38 plates correctly, you have normal color vision. If you can see 35 to 37 plates correctly, you may have a mild color vision deficiency. If you can see 24 to 34 plates correctly, you may have a moderate color vision deficiency. If you can see less than 24 plates correctly, you may have a severe color vision deficiency.


The Ishihara test can also indicate which type of color blindness you have based on which plates you can or cannot see. For example, if you cannot see the number 8 on plate 2, but you can see the number 6 on plate 3, you may have protan color blindness. If you cannot see the number 6 on plate 3, but you can see the number 8 on plate 2, you may have deutan color blindness.


What are the limitations and alternatives of the Ishihara test?




The Ishihara test is a simple and accurate method for discovering congenital color blindness, which means that you are born with it and it does not change over time. However, it has some limitations and may not be suitable for everyone.


Some of the limitations of the Ishihara test are:


  • It cannot detect other types of color blindness, such as blue-yellow color blindness or total color blindness.



  • It cannot measure the severity or extent of your color vision deficiency.



  • It may not be reliable for young children, elderly people, or people with low vision or other eye conditions.



  • It may be affected by external factors such as lighting, viewing distance, or printing quality.



If the Ishihara test is not available or appropriate for you, there are some alternatives that you can try. Some of them are:


  • The Farnsworth-Munsell 100 Hue Test: This is a more complex and precise test that involves arranging colored discs in order of hue.



  • The Anomaloscope: This is an instrument that allows you to match colors by adjusting the brightness and hue of two light sources.



  • The Color Vision Testing Made Easy: This is a simplified version of the Ishihara test that uses shapes instead of numbers and is suitable for children and adults.



  • The EnChroma Color Blind Test: This is an online test that uses images and questions to assess your color vision and recommend glasses that can enhance it.



Conclusion




The Ishihara test is a useful tool for screening and diagnosing red-green color blindness. It is easy to perform and interpret, and it can help you understand how your color vision affects your daily life. However, it is not perfect and it may not work for everyone. If you have any doubts or concerns about your color vision, you should consult an eye doctor or a specialist for further evaluation and advice.


How to download and use the Ishihara Test 38 Plates.pdf?




If you want to try the Ishihara test by yourself, you can download the Ishihara Test 38 Plates.pdf from various online sources. However, you should be aware that the quality and accuracy of the test may vary depending on the source, the printing method, and the viewing conditions. Therefore, you should not rely on the online test as a substitute for a professional diagnosis.


To use the Ishihara Test 38 Plates.pdf, you will need a device that can open PDF files, such as a computer, a tablet, or a smartphone. You will also need a printer that can print in color, preferably with high resolution and contrast. You should print the plates on a white paper with no gloss or texture. You should also avoid folding or bending the paper, as this may affect the colors.


Once you have printed the plates, you can start the test by looking at each plate one by one and saying what number or shape you see, or if you see nothing at all. You can use a timer to limit yourself to 3 seconds per plate, as this is the standard time used by eye doctors. You can also record your answers on a paper or a device for later comparison. You can find the correct answers and explanations for each plate online or in the original book by Dr. Ishihara.


What are the benefits and drawbacks of the Ishihara test?




The Ishihara test is one of the most popular and widely used tests for color vision deficiency in the world. It has some benefits and drawbacks that you should consider before taking it.


Some of the benefits of the Ishihara test are:


  • It is simple and easy to perform and interpret.



  • It is inexpensive and widely available.



  • It can detect most cases of red-green color blindness.



  • It can help you understand how your color vision affects your daily life.



Some of the drawbacks of the Ishihara test are:


  • It cannot detect other types of color blindness, such as blue-yellow color blindness or total color blindness.



  • It cannot measure the severity or extent of your color vision deficiency.



  • It may not be reliable for young children, elderly people, or people with low vision or other eye conditions.



  • It may be affected by external factors such as lighting, viewing distance, or printing quality.



Conclusion




The Ishihara Test 38 Plates.pdf is a useful tool for screening and diagnosing red-green color blindness. It is easy to download and use, but it may not be suitable for everyone. If you have any doubts or concerns about your color vision, you should consult an eye doctor or a specialist for further evaluation and advice.


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