Corneal surface curvature and diopter measuring instrument YZ38


Product Description

This product is used to measure the curvature and diopter of the corneal surface, as well as the axial and astigmatism of the corneal astigmatism. It can be used to calculate the refractive power of the implanted lens in conjunction with A-scan. Technical parameters Measuring range Curvature radius 5.5~11mm Diopter 30~60D *Small graduation value radius 0.02mm Diopter 0.25D Required minimum surface area for measurement r=5.5mm φ1.65mm r=7.5mm φ2.36mm r=11mm φ3.36mm

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Product Advantages

1. During the fitting process of contact lenses, the base curve of the lens can be selected according to the radius of curvature of the principal meridian of the anterior surface of the cornea of ​​the customer.

In selecting the base curve of the lens, the base curve of the lens is equal to or slightly larger than the radius of curvature of the principal meridian of the anterior surface of the cornea. The following formula can be used to obtain:

BC = the sum of the radii of curvature of two mutually perpendicular principal meridians/2×1.1

For example, the curvature radii of two principal meridians that are perpendicular to each other are measured to be 7.6 and 7.8.

BC=7.6+7.8/2×1.1 =8.47

2. Evaluation of the tightness of contact lenses after wearing.

When testing, make the wearer blink. If the wearer is well worn, the visual mark will always be clear and unchanged;

If worn too loosely, the image will be clear before blinking, and the image will be blurred immediately after blinking, and it will be clear again after a while;

If it is worn too tightly, the image will be clear before blinking, and the blur will be restored for a while.

3. A keratometer can be used to detect the degree of astigmatism, axial direction and distinguish the type of astigmatism.

If there is astigmatism in the optometry, use a keratometer to detect astigmatism, indicating that the astigmatism is all intraocular astigmatism.

If there is astigmatism in optometry, astigmatism is also detected with a keratometer, and the astigmatism of the two is equal, and the axial direction is the same, indicating that the astigmatism of the eye is all corneal astigmatism.

If the astigmatism in the optometry is not equal to the astigmatism detected by the keratometer and the axial direction is inconsistent, it means that the astigmatism is a mixture of corneal astigmatism and intraocular astigmatism.

If there is no astigmatism in optometry, use a keratometer to detect astigmatism, which means that the degrees of corneal astigmatism and intraocular astigmatism are equal, and the signs are opposite, the axis is the same, and the two cancel each other out. This astigmatism can be corrected with a spherical lens.

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4. For certain corneal diseases such as keratoconus, keratoconus, etc., the keratometer can be used as a diagnostic basis. The measurement of the degree of implantation before intraocular lens implantation and the design and result analysis of various refractive operations require the measurement of a keratometer. In addition, you can learn about the secretion of tears and so on.

Technical Parameter

Measuring range 

★The radius of curvature

5.5—11mm

Diopter

30—60D

Minimum graduation value 

Radius

 0.02mm

★Diopter

 0.25D

Minimum surface area required for measurement

When r=5.5mm

φ1.65mm

When r=7.5mm

φ2.36mm

When r=11mm

φ3.36mm


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