CN105549131B - A kind of serial Test lenses for being used to examine contact lense geometric parameter measurement instrument - Google Patents

Abstract

The invention relates to a series of calibration lenses used for testing instruments for measuring geometric parameters of contact lenses, and belongs to the field of testing and measurement technology and instruments. Including: a series of diameter calibration lenses, a series of curvature radius calibration lenses and a series of center thickness calibration lenses; the diameter calibration lens is a flat lens with a circular shape, and the front and rear surfaces are flat; the curvature radius calibration lens is Concave lens, the shape is circular, and the front surface and the back surface are both spherical; the center thickness calibration lens is a concave lens, the shape is circular, and the front surface and the back surface are both spherical; the present invention is close to the product structure of the contact lens by design. Different specifications of diameter calibration lenses, curvature radius calibration lenses and central thickness calibration lenses realize the accuracy of diameter indication error, curvature radius indication error and central thickness indication error of contact lens geometric parameter measuring instruments with different principles test.

Description

A series of calibration lenses for testing the geometric parameter measuring instrument of contact lenses

technical field

The invention relates to a series of calibration lenses used for testing instruments for measuring geometric parameters of contact lenses, and belongs to the field of testing and measurement technology and instruments.

Background technique

In clinical ophthalmology, there are three main methods for correcting patients' refractive error: wearing frame glasses, wearing contact lenses and refractive surgery. The vast majority of patients choose to wear glasses or contact lenses to correct refractive error and improve vision. Due to the advantages of beautiful appearance, large field of view, real vision, and comfortable wearing, contact lenses have been favored by more and more consumers, especially young people and special workers. Contact lenses, commonly known as contact lenses, are directly attached to the surface of the cornea of the human eye. There are many performance parameters to evaluate the quality of contact lens products, including optical parameters and geometric parameters, and geometric parameters such as diameter, curvature radius and central thickness are directly related to the wearing effect and vision safety of contact lenses. The contact lens geometric parameter measuring instrument is specially used to measure the diameter, curvature radius and central thickness of various contact lenses. The accuracy of the measurement results directly affects the quality evaluation and fitting of contact lenses.

To examine whether the measurement results given by the contact lens geometric parameter measuring instrument are accurate, it is necessary to provide the corresponding calibration method and use the corresponding calibration lens to test it. Therefore, a method for testing the contact lens geometric parameter measurement is developed and designed. A series of calibration lenses for instrument indication errors is an important means to evaluate the accuracy of various geometric parameters of such instruments.

Contact lenses are generally divided into hard contact lenses and soft contact lenses according to their materials and shapes. The geometric parameters of hard contact lenses are generally measured in air, while the geometric parameters of soft contact lenses need to be measured in solution. There are many types of measurement instruments for contact lens geometric parameters with different principles, such as projection method, sagittal height method, reflection imaging method, contact thickness measurement method, etc. Therefore, calibration lenses need to be designed for different parameters to meet the needs of different types of contact lenses. Indication error test of geometric parameter measuring instruments.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing measuring instruments cannot be calibrated, and provide a series of calibration lenses for testing the geometric parameter measuring instruments of contact lenses, which can be used for the diameter indication error of the geometric parameter measuring instruments of contact lenses , Accurate inspection of the indication error of the curvature radius and the center thickness indication error, so as to ensure that the measurement results given by the instrument are accurate and reliable.

The purpose of the present invention is achieved through the following technical solutions.

A series of calibration lenses for testing the geometric parameter measuring instruments of contact lenses, including: a series of diameter calibration lenses, a series of curvature radius calibration lenses and a series of center thickness calibration lenses; the diameter calibration lenses are plane lenses with a circular shape The center thickness calibration lens is a concave lens with a circular shape, the front surface, the rear surface The surfaces are all spherical.

The series of diameter calibration lenses are composed of plane lenses with different diameter specifications and the same center thickness; the series of curvature radius calibration lenses are composed of concave lenses with different back surface curvature radii, the same front surface curvature radius, and the same center thickness Composition: The series of central thickness calibration lenses are composed of concave lenses with different central thicknesses, the same curvature radius of the front surface, and the same curvature radius of the rear surface.

The diameter calibration lens, curvature radius calibration lens and central thickness calibration lens are made of the same material, preferably colorless optical glass.

The front and rear surfaces of the diameter calibration lens, curvature radius calibration lens, and central thickness calibration lens are all finely polished, and through high-precision measurement of parameters such as diameter, curvature radius, and central thickness, accurate and effective values are guaranteed. Traceability.

The structural design of the diameter calibration lens, curvature radius calibration lens and central thickness calibration lens simulates the actual contact lens, which can be applied in air or in solution to meet the measurement of different contact lens geometric parameters Instrument indication error test.

Beneficial effect

1. A series of calibration lenses used for testing contact lens geometric parameter measuring instruments of the present invention, by designing diameter calibration lenses, curvature radius calibration lenses and central thickness calibration lenses with different specifications close to the contact lens product structure The lens realizes the accurate inspection of the diameter indication error, the curvature radius indication error and the central thickness indication error of contact lens geometric parameter measuring instruments with different principles.

2. A series of calibration lenses used for testing contact lens geometric parameter measuring instruments of the present invention, including diameter calibration lenses, curvature radius calibration lenses and center thickness calibration lenses, through quality control of various lens structural parameters , which can ensure the accurate determination of the three parameters of the diameter of the calibration lens, the radius of curvature of the back surface and the center thickness, and realize effective traceability. The structural design can be used not only in air but also in solution, and has the advantages of simple structure and convenient operation.

Description of drawings

Fig. 1 is the schematic diagram of the diameter calibration lens of the present invention;

Fig. 2 is the schematic diagram of the radius of curvature verification lens of the present invention;

Fig. 3 is a schematic diagram of the central thickness calibration lens of the present invention.

Among them, 1-diameter calibration lens, 2-curvature radius calibration lens, 3-central thickness calibration lens, 4-front surface, 5-back surface.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

Example 1

The invention relates to a series of calibration lenses for testing instruments for measuring geometric parameters of contact lenses, comprising a diameter calibration lens, a curvature radius calibration lens and a central thickness calibration lens. The diameter calibration lens is used to test the diameter indication error of the contact lens geometric parameter measuring instrument, the curvature radius calibration lens is used to test the curvature radius indication error of the contact lens geometric parameter measuring instrument, and the center thickness calibration lens is used to test the contact lens The central thickness indication error of the geometric parameter measuring instrument.

The invention provides a series of calibration lenses for testing a contact lens geometric parameter measuring instrument, including:

Diameter calibration lens, as shown in Figure 1. The diameter checking lens is a plane lens with a circular shape, and both the front surface and the back surface are plane. It is composed of three plane lenses with different diameters but the same center thickness of Φ10mm, Φ13mm and Φ15mm. During the processing, the diameter of the diameter calibration lens is strictly controlled, and its diameter is measured with a high-precision projector and digital calipers to ensure accurate measurement and effective traceability. The expanded uncertainty of the diameter standard value of the diameter calibration lens can reach 0.01mm (k=2), fully meeting the display error requirement of ±0.05mm of the contact lens diameter measuring instrument.

Radius of curvature calibration lens, as shown in Figure 2. The radius of curvature verification lens is a concave lens with a circular shape, both the front surface and the back surface are spherical, and is composed of three concave lenses with different back surface curvature radii of R7mm, R8mm and R9mm. In order to reduce the processing quantity of the spherical sample and reduce the cost, the curvature radii of the front surfaces of the three different specifications of the curvature radius verification lenses are the same, and the center thickness is also the same. During the processing, the spherical shape of the rear surface is strictly controlled based on the principle of interference, and the radius of curvature of the rear surface is measured with a high-precision spherometer to ensure accurate values and effective traceability. The expanded uncertainty of the standard value of the radius of curvature of the radius of curvature calibration lens can reach 0.01mm (k=2), fully meeting the display error requirement of ±0.05mm of the contact lens radius of curvature measuring instrument.

Center thickness calibration lens, as shown in Figure 3. The central thickness calibration lens is a concave lens with a circular shape, the front surface and the rear surface are both spherical, and consists of three concave lenses with different central thicknesses of 0.20mm, 0.25mm and 0.30mm. In order to reduce the number of processing spherical samples, the curvature radii of the front surfaces and the curvature radii of the rear surfaces of the three calibration lenses with different center thicknesses are all the same. In the process of processing, the central thickness of the center thickness of the calibration lens is strictly controlled, and the central thickness of the lens is measured by a high-precision thickness gauge to ensure that the value is accurate and effectively traceable. The expanded uncertainty of the center thickness standard value of the center thickness calibration lens can reach 0.002mm (k=2), fully meeting the display value error requirement of ±0.005mm of the contact lens center thickness measuring instrument.

The material of the diameter calibration lens, curvature radius calibration lens and center thickness calibration lens is colorless crown optical glass, which is conducive to maintaining the stability and reproduction of the value.

The diameter calibration lens, curvature radius calibration lens and central thickness calibration lens can be applied in air or in solution, and can meet the display error inspection of different contact lens geometric parameter measuring instruments.

The series of calibration lenses provided by the invention for testing instruments for measuring geometric parameters of contact lenses can be used for testing the errors of diameter indication, curvature radius indication and center thickness indication of such instruments.

The specific working process is as follows: When inspecting the diameter indication error of the contact lens geometric parameter measuring instrument, take out the diameter calibration lens and put it into the diameter measurement unit of the instrument, and check the diameter of the diameter calibration lens according to the operating instructions of the instrument. The diameter is measured, and the measured value is compared with the diameter standard value of the diameter calibration lens, and the diameter indication error of the instrument can be obtained. According to this method, the diameter calibration lenses of three different specifications are measured separately. Obtain the corresponding diameter indication error; when inspecting the curvature radius indication error of the contact lens geometric parameter measuring instrument, take out the curvature radius verification lens and put it into the curvature radius measurement unit of the instrument, follow the operating instructions of the instrument Measure the curvature radius of the back surface of the curvature radius calibration lens, and compare the measured value with the curvature radius standard value of the curvature radius calibration lens to obtain the indication error of the curvature radius of the instrument. According to this method, three The curvature radius verification lenses of different specifications are measured separately to obtain the corresponding curvature radius indication error; when inspecting the center thickness indication error of the contact lens geometric parameter measuring instrument, the center thickness verification lens is taken out and put into In the center thickness measuring unit of the instrument, measure the center thickness of the center thickness calibration lens according to the operation instructions of the instrument, and compare the measured value with the center thickness standard value of the center thickness calibration lens to obtain the center thickness of the instrument Indication error, according to this method, the center thickness calibration lenses of three different specifications are measured respectively, and the corresponding center thickness indication error is obtained.

The specific embodiment of the present invention has been described above in conjunction with the accompanying drawings, but these descriptions can not be interpreted as limiting the scope of the present invention, the scope of protection of the present invention is defined by the appended claims, any changes based on the claims All are protection scope of the present invention.

Claims (6)

1. A kind of 1. serial Test lenses for being used to examine contact lense geometric parameter measurement instrument, it is characterised in that：By serial diameter Test lenses (1), serial radius of curvature Test lenses (2) and serial center thickness Test lenses (3) composition；Described series is straight Footpath Test lenses (1) are made up of the planar lens with different diameter specifications, identical central thickness；Described serial radius of curvature Test lenses (2) by with surface after difference (5) radius of curvature, mutually the same surface (4) radius of curvature, identical central thickness it is recessed Lens form；Described serial center thickness Test lenses (3) are by with different center thicknesses, the same surface (4) curvature half of phase Footpath, the concavees lens composition of identical rear surface (5) radius of curvature.
2. 2. a kind of serial Test lenses for being used to examine contact lense geometric parameter measurement instrument as claimed in claim 1, it is special Sign is：The diameter Test lenses (1) are planar lens, and profile is circle, and preceding surface (4), rear surface (5) are plane； The radius of curvature Test lenses (2) are concavees lens, and profile is circle, and preceding surface (4), rear surface (5) are sphere；In described Heart thickness Test lenses (3) are concavees lens, and profile is circle, and preceding surface (4), rear surface (5) are sphere.
3. 3. a kind of serial Test lenses for being used to examine contact lense geometric parameter measurement instrument as claimed in claim 1 or 2, its It is characterised by：The material of described diameter Test lenses (1), radius of curvature Test lenses (2) and center thickness Test lenses (3) For colouless optical glass.
4. 4. a kind of serial Test lenses for being used to examine contact lense geometric parameter measurement instrument as claimed in claim 3, it is special Sign is：The preceding surface of described diameter Test lenses (1), radius of curvature Test lenses (2) and center thickness Test lenses (3) (4), the fine polishing of rear surface (5).
5. 5. a kind of serial Test lenses for being used to examine contact lense geometric parameter measurement instrument as claimed in claim 4, it is special Sign is：Described diameter Test lenses (1), radius of curvature Test lenses (2) and center thickness Test lenses (3) can be in sky Apply in gas, can also apply in the solution, to meet that the error of indication of different contact lense geometric parameter measurement instruments is examined.
6. 6. a kind of serial Test lenses for being used to examine contact lense geometric parameter measurement instrument as claimed in claim 1 or 2, its It is characterised by：Method of calibration is：When the diameter error of indication to contact lense geometric parameter measurement instrument is tested, by diameter Test lenses (1) take out, and are put into the diameter measurement unit of instrument, according to the operating instruction of instrument to diameter Test lenses (1) diameter measures, by obtained measured value compared with the diameter criteria value of diameter Test lenses (1), you can To the diameter error of indication of the instrument；When the radius of curvature error of indication to contact lense geometric parameter measurement instrument is tested When, radius of curvature Test lenses (2) are taken out, and be put into the radius of curvature measurement unit of instrument, said according to the operation of instrument Bright rear surface (5) radius of curvature to radius of curvature Test lenses (2) measures, by measured value and radius of curvature Test lenses (2) radius of curvature standard value is compared, you can obtains the radius of curvature error of indication of the instrument；When to contact lense geometric parameters When the center thickness error of indication of number measuring instrument is tested, center thickness Test lenses (3) are taken out, and be put into instrument In center thickness measuring unit, the center thickness of center thickness Test lenses (3) is measured according to the operating instruction of instrument, By measured value compared with the center thickness standard value of center thickness Test lenses (3), you can the center for obtaining the instrument is thick Spend the error of indication.