Question

How can i measure segment height for progressive lens

Answer 1

To measure the segment height for a progressive lens, use a lensometer. Follow these steps: place the lens on the lensometer, rotate it to locate the channel, find the marking for segment height, align the measurement lines, and read the measurement.

Step-by-step explanation:

To measure the segment height for a progressive lens, you will need a lensometer. A lensometer is a device used to measure the properties of lenses, including the segment height. Here's how you can do it:

1. Place the progressive lens on the lensometer platform.
2. Rotate the lens until you see the channel or corridor of the lens.
3. Locate the line or marking on the lens that represents the segment height.
4. Align the lensometer measurement lines with the marking on the lens.
5. Read the measurement on the lensometer to determine the segment height.

Remember to follow the instructions provided with the specific lensometer you are using for accurate measurements.

Answer 2

To measure segment height for progressive lenses, align the mark with the wearer's lower eyelid while they wear the frame, then measure from the bottom of the lens to the mark using a millimeter ruler.

Step-by-step explanation:

Measuring the segment height for progressive lenses is an essential step in ensuring a proper fit for eyeglasses. The segment height is the vertical measurement from the bottom of the lens to the beginning of the progressive addition, or the reading portion. To measure segment height, you need the frame that the lenses will be in and a marker to mark the lens.

Here's a step-by-step guide:

1. Place the glasses on the wearer's face and ensure they are sitting comfortably with their natural posture.
2. Have the wearer look straight ahead and mark the lens directly in line with the lower eyelid. This mark represents the segment height.
3. Once the mark is made, remove the glasses and use a millimeter ruler to measure from the bottom of the lens to the mark. This is the segment height measurement.

It is important to be precise in this measurement, as it affects the wearer's comfort and the effectiveness of the progressive lenses.