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Lensmeter
5 products
Get accuracy that you can count on with AngelUS Medical Lensmeters. Our lensmeter are state of the art for the measurement of lens and its ideal for practices that require quality and efficiency equipment.
5 products
A lensmeter, also known as a lensometer or focimeter, is an essential tool in optics, specifically used to verify the correct prescription in eyeglasses. To understand how a lensmeter works and its importance, let’s break down the device and its function with the help of easy-to-understand analogies.
What is a Lensmeter?
Think of a lensmeter as a kind of microscope specifically designed to look at lenses. Just as a microscope lets you see tiny details that are invisible to the naked eye, a lensmeter lets opticians see and measure the power of lenses in eyeglasses. It helps ensure that the lenses match the prescription provided by an eye doctor.
Components of a Lensmeter
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Eyepiece: This is where you look into the lensmeter. It’s like the eyepiece of a telescope, allowing you to see what’s inside.
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Lens Holder: This is a small platform where the lens is placed, similar to how you’d place a slide under a microscope.
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Target (Reticle): Inside the lensmeter, there’s a target that looks like a cross or other pattern. It helps in aligning and measuring the lens.
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Adjustment Knobs: These knobs allow you to move the lens and adjust the focus, much like the focusing knobs on a camera.
- Measurement Scale: This scale shows the power of the lens, usually marked in diopters, which is the unit of lens power.
How a Lensmeter Works
Let’s dive into the working of a lensmeter using an analogy:
Imagine you have a magnifying glass, and you’re trying to find out how powerful it is by looking at how much it magnifies a grid of lines. Here’s how a lensmeter performs a similar function:
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Light Source: The lensmeter has a built-in light source that illuminates the target (the grid of lines inside the device).
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Viewing the Target: When you place a lens on the lens holder, you look through the eyepiece. The lens you’re testing bends the light passing through it, altering how you see the target.
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Focusing the Target: By adjusting the knobs, you bring the target into sharp focus. The adjustments needed to do this tell you about the lens’s power.
- Reading the Measurement: The measurement scale shows how much adjustment was needed to focus the target, which directly corresponds to the power of the lens in diopters.
Types of Measurements
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Sphere Power: This tells you if the lens is for nearsightedness (myopia) or farsightedness (hyperopia). Think of it as the basic strength of the lens.
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Cylinder Power: This measures astigmatism, which is when the lens has different powers in different orientations. Imagine a lens that’s more like a rugby ball than a soccer ball; it has a different curve along one axis.
- Axis: This tells you the orientation of the astigmatism correction. It’s like knowing the direction to point a telescope to see a particular star.
Steps to Use a Lensmeter
- Place the Lens: Put the lens you want to measure on the lens holder.
- Align the Lens: Use the adjustment knobs to move the lens until the target is centered in the eyepiece.
- Focus the Target: Turn the focus knob until the target appears sharp and clear.
- Read the Measurement: Look at the measurement scale to find the sphere, cylinder, and axis readings.
Practical Applications
- Verifying Prescriptions: Ensures that the glasses match the doctor’s prescription.
- Marking Optical Centers: Helps in locating the exact center of the lens where the prescription is accurate.
- Checking Lenses in Production: Used in manufacturing to check lenses before they are cut and fitted into frames.
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