Monitor position with bifocal lenses for far and near vision (General purpose bifocals)

General purpose bifocals include two different optical powers. Clear distance vision is provided by the main lens (shown in blue) and clear near vision for reading is provided an additional lens that is inset (shown in red) in the lower part of the main lens.

 

Monitor position with bifocal lenses for far and near vision (General purpose bifocals)

 

Quick Start Guide
For computer work, you should not view through the lower inset in the lens, thus, the monitor should be placed high enough so that you can see the screen through the main lens of the general purpose bifocals. You should always be able to look straight above the monitor beyond into the room.

 

If you have any questions about your glasses, you can return to information in SECOND STEP Bifocal glasses for distance and near vision or universal bifocals

Detailed instruction: Monitor Position – General purpose bifocals:

Before you start, you should adopt an ergonomic sitting posture as shown in FIRST STEP.

Use the following steps to adjust the height of the monitor so that the head tilt is not strenuous but feels comfortable.. However, always make sure that your look can still go straight above the monitor if you try to look behind it:

  1. Tilt your head with eyes closed significantly up and down. Find with decreasing head movements your individually comfortable head tilt, which you please retain for the next step .
  2. With the retained comfortable head tilt and closed eyes, move now only the eyes up and down . Start with distinct tendencies of the eyes up and down movement and you will find the pleasant eye inclination.
  3. If you now open your eyes and look through the distance portion of your bifocals on the top third of your monitor, the height is correct . Otherwise, adjust the height position of the monitor accordingly

Shift the monitor stepwise from a long viewing distance (about 100 cm) to a short viewing distance (about 50 cm) while you observe text characters on the screen with a size of about 3 mm that can easily be seen (a colleague may help you). You will notice that the clarity of the text changes and you can find out at which monitor position the text appears most clearly and vision is comfortable:

  1. If clear vision is found very near (at about 50 cm), then your computer lenses may be too strong: computer work at such a short viewing distance is stressful for the ocular muscles in the long run. Check with an optician / optometrist whether these glasses are suitable for working at a computer work place.
  1. If clear vision is found near 100 cm, this is often relaxing for the ocular muscles. But long viewing distances require larger text characters of about 5 mm that cannot always be achieved.
  2. If, in this range, you do not reach clear vision at the monitor, as you know it from distance vision, then your lenses may not be appropriate. Then, you better have your vision tested.

When you have worked with the chosen position for some days, you may experience whether the monitor position is really optimal for you. If not, you may change the monitor position again. For the fine adjustment, you may tilt the monitor in a way so that you look perpendicularly onto the screen surface: the more you look down, the more the monitor has to be tilted.

Additionally, it is important that the height of the monitor is chosen that you see the screen through the main lens and not through the lower inset window since the latter is designed for reading of text documents.

General purpose bifocals can be a suitable choice in the early stage of presbyopia when the natural accommodation of the eye is sufficient to see the monitor clearly without near vision addition. Therefore, longer viewing distances may be helpful.

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