GB 45185-2024Optometry products - Safety technical specifications for finished spectacles (English PDF)

3.1 Finished spectacle

All types of spectacles ready for immediate use.

NOTE: the types generally refer to common spectacles, partially or fully enclosed eye masks, reversible or removable attachment lenses, etc. Common finished spectacles include prescription assembled spectacles, near-vision spectacles, sunglasses, swimming goggles, mountain and snowfield goggles, specialized spectacles for motor vehicle drivers, polarized 3D spectacles, etc.

3.2 Assembled spectacle

Finished spectacles assembled from lenses with vertex power and frames.

NOTE: assembled spectacles are categorized into prescription assembled spectacles and near-vision spectacles.

3.3 Prescription assembled spectacle

Assembled spectacles manufactured in accordance with a prescription processing form or specific requirements.

3.4 Near-vision spectacle

Mass-produced assembled spectacles primarily for near-vision use.

NOTE: they are generally categorized into single-focal near-vision spectacles, multi-focal near-vision spectacles, and progressive-focal near-vision spectacles.

3.5 Centration point

In the absence of prescription prism degree and thinned prisms, or when such prism effects are negated, the point located at the optical center, distance reference point or fitting point, and associated with the frame.

NOTE: generally, the centration point of a single-focal (except fixed-point single-focal) lens is referred to as the optical center; the centration point of a multi-focal lens is referred to as the distance reference point; the centration point of a fixed-point single-focal lens or progressive-focal lens is referred to as the fitting point. [source: ISO 13666:2019, 3.2.30, modified]

3.6 Centration point distance; CD

centration point horizontal distance

The distance between the centration points of the two lenses in the horizontal direction.

NOTE 1: interpupillary distance, which refers to the distance between the geometric centers of the pupils of two eyes, is usually abbreviated as PD.

NOTE 2: interpupillary distance is commonly used in industry to indicate the nominal value of the horizontal distance between the centration points. [source: ISO 13666:2019, 3.2.31, modified]

3.7 Centration point horizontal distance of one-side

The distance between the centration point of a one-side lens and the vertical axis of symmetry between the lens rings (enclosing-square method) in the horizontal direction.

NOTE 1: mono-pupillary distance is commonly used in industry to indicate the nominal value of the one-side horizontal distance of the centration point.

4.5 Transmission Performance

If the manufacturer marks the luminous transmittance values, for Category SW0 ~ Category SW3 lenses, the absolute deviation of the luminous transmittance shall not exceed ±3%; for Category SW4 lenses, the relative deviation of the luminous transmittance shall not exceed ±30%.

4.5.2 Relative deviation of luminous transmittance

4.5.2.1 In accordance with the method described in 5.5.2, carry out the test. The relative deviation of luminous transmittance between the left and right lenses of sunglasses with zero diopter shall not exceed 15%.

4.5.2.2 In accordance with the method described in 5.5.2, carry out the test. The relative deviation of luminous transmittance between the reference points of the left and right lenses of swimming goggles shall not exceed 15%.

4.5.3 Traffic signal recognition

4.5.3.1 In accordance with the method described in 5.5.3, carry out the test. The relative visual attenuation factor (Q) of sunglasses used for walking and driving shall meet the following requirements.

---Red, Q >= 0.80;

---Yellow, Q >= 0.60;

---Green, Q >= 0.60;

---Blue, Q >= 0.60.

4.5.3.2 In accordance with the method described in 5.5.3, carry out the test. The relative visual attenuation factor (Q) of finished spectacles (excluding sunglasses) used for walking and driving shall meet the following requirements.

---Red, Q >= 0.80;

---Yellow, Q >= 0.60;

---Green, Q >= 0.60;

---Blue, Q >= 0.40.

5.1 Test Conditions

The ambient temperature shall be 23 °C ± 5 °C.

5.2 Vertex Power

5.2.1 Finished spectacles

Place the lower edge of the finished spectacles against the reference backup plate of the lensometer. Place one of the lenses with its posterior surface facing the support of the lensometer and keep it centered. In accordance with the type of finished spectacles, measure at the reference point on the lens. Repeat the above steps to measure the other lens of the finished spectacles. If the manufacturer explicitly states that the vertex power is corrected for the wearing position, then, take the corrected vertex power as a contrast for measurement. The manufacturer's stated corrected vertex power for the wearing position shall be indicated on the packaging and accompanying documents.

5.2.2 Sunglasses with zero diopter

5.2.2.1 General

Measurements shall be conducted using the finite telescope method. Other equivalent measurement methods, for example, the lensometer method, may also be used.

If the measurement results of the finite telescope method differ from those of the lensometer method, the finite telescope method shall prevail.

5.2.2.2 Finite telescope method

5.2.2.2.1 Test device

See GB 45184 for the test device.

5.2.2.2.2 Test procedures

5.2.2.2.2.1 Adjustment of test device

See GB 45184 for the adjustment of the test device.

5.2.2.2.2.2 Measurement position

For samples with a designated wearing position, measurements shall be conducted at the designated wearing position. For samples without a designated wearing position, measurements shall be conducted using the following placement methods.

---Sunglasses with zero diopter and separated lenses: place the lens surface perpendicular to the optical axis of the system and measure at measurement point C as specified in Figure 1.

---Binocular sunglasses with zero diopter: place the lens surface perpendicular to the optical axis of the system and measure at measurement point R as specified in Figure 2. […]