Eldosmart Opticals LTD

Ishihara Test – Purpose and How It Works

1️⃣ What is the Ishihara Test?

The Ishihara test is a simple eye test used to detect color vision deficiency (color blindness). It mainly checks problems in distinguishing red and green colors, which is the most common type of color blindness.
It was developed by the Japanese ophthalmologist Shinobu Ishihara in 1917.

🎯 Purpose of Ishihara Test
The test is used to:
Detect red-green color blindness
Screen patients during eye examination
Check visual fitness for certain jobs (driver, pilot, military, etc.)
Identify congenital or acquired color vision defects

⚙️ How the Ishihara Test Works

The test uses special plates called pseudo-isochromatic plates.
Each plate contains:
Many colored dots
A number or pattern hidden inside the dots
Procedure
The patient sits at about 75 cm distance from the chart.
Plates are shown one by one for about 3 seconds.
The patient is asked to read the number seen in the plate.
Interpretation
Normal color vision: Patient reads the correct number.
Red-green deficiency: Patient cannot see the number or reads a different number.
Example:
Normal person may see 12
Color-deficient person may see nothing or another number

📊 Types of Ishihara Plates

Transformation plates – number seen differently by normal and color-deficient people
Vanishing plates – number visible to normal but not to color-blind person
Hidden plates – number seen only by color-deficient people
Diagnostic plates – help determine the type of defect

🩺 Clinical Importance
The Ishihara test is widely used in:
Optometry
Ophthalmology clinics
School screening
Medical examinations for jobs
It is one of the most common and reliable screening tests for color blindness.

PERIPHERAL RETINAL DEGENERATIONS📌👁
Source👇

Dr-Muzamil Hussain Baloch

Spiderweb-Like Vitreous Changes in a Vasoproliferative Tumor:
◾A 24-year-old man with a history of a vasoproliferative tumor in his right eye presented with right vision loss that had progressed over 5 years. His right eye best-corrected visual acuity had decreased to 20/320.
◾A confocal light-emitting diode-based retinal imaging system clearly showed a 3-dimensional, spiderweb-like proliferative change in the vitreous body above the posterior pole (A) and abnormal retinal vessels in the peripheral retina (B).
◾OCT showed significant retinal folds with overlying dense epiretinal membrane (C).
◾Two years after the removal of the vitreous proliferation via vitrectomy, the retinal folds had resolved (D), and his best-corrected visual acuity recovered to 20/32.
This Demonstrates the importance of having your eye regularly checked by an eye care professional.
Visit us today to get your eye examined

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SHORT NOTE ABOUT THE TRIAL FRAME

A trial frame is a tool used by ophthalmic professionals like OPTOMETRISTS and OPHTHALMOLOGISTS. It is basically an adjustable spectacle frame with multiple cells, used to hold corrective lenses, and other accessories in subjective refraction (finding the correct spectacle power) and retinoscopy.

Trial Lens is one of the primary equipment used during lens prescription after obtaining visual acuity result, diagnosing a patient with refractive anomaly, successful treatment of pathological conditions which required steroids or surgery. It's the last instrument to be used on the patient: which means this instrument is used to prescribe lenses which is finally used by a patient to see and resolve fine details

It's a prefabricated optical instrument: it is built up by the joining together of large and small spare parts which could be adjusted at any point in time. It has axis rotatory knobs/axis cylinder lens cells

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