What is what if pd is off by 2mm?

If the PD (pupillary distance) measurement is off by 2mm, it can result in a number of visual disturbances and discomfort for the individual wearing the glasses. Some possible effects of an incorrect PD measurement include:

1. Blurry vision: If the PD is too wide or too narrow, it can lead to a misalignment of the optical centers of the lenses with the pupil, causing blurry vision.

2. Eye strain: An incorrect PD measurement can cause eye strain as the eyes work harder to focus properly.

3. Headaches: Misalignment of the lenses can cause headaches as the eyes strain to try to adjust to the new position.

4. Distorted depth perception: A misaligned PD can affect depth perception, making it difficult to judge distances accurately.

5. Discomfort: Wearing glasses with an incorrect PD can cause discomfort and may even lead to feelings of dizziness or nausea.

It is important to ensure that the PD measurement is accurate when getting glasses or contact lenses prescribed by an optometrist or optician to avoid these potential issues. If you experience any of the above symptoms when wearing glasses, it is advisable to visit your eye care professional to check and adjust the PD measurement if necessary.