Question: How do you take a mono PD w/ penlight + ruler on strabismus patient?

[bebechica]

I have a question on how to measure mono pd with a penlight and ruler on a strabismus patient (with phoria, not tropia). How do you do this without moving the ruler while occluding the eye not being looked at?

Obviously if you knew they had strabismus by doing a cover-uncover test or alternate cover test, you would take a canthus to canthus measurement instead.

[npdr]

I have a question on how to measure mono pd with a penlight and ruler on a strabismus patient (with phoria, not tropia). How do you do this without moving the ruler while occluding the eye not being looked at?

Obviously if you knew they had strabismus by doing a cover-uncover test or alternate cover test, you would take a canthus to canthus measurement instead.

Dear new optician,
A truly constant strabismic patient is not phoric. Is the patient an intermittent strabismic? If the patient is truly strabismic then there is a lack of binocularity and there is no downside or consequences of placing the optical centers geocentric to the frame in a single vision lens.

[Aarlan]

Use a corneal reflex pupilometer, not a PD stick.

AA

[HarryChiling]

If you hold the ruler between your pinky finger and index finger (plastic rule) you can use that same hand to cover the eye while the other holds the penlight. Honestly it would be better to use a pupilometer, because it has an occluder in it making the task a whole lot easier.

[Darryl Meister]

You can also hold the PD ruler at a slight angle, occluding the pupil of the left eye while taking the right eye measurement, which will allow the right eye to maintain fixation. This technique would still only require one hand. Repeat for the eye.