Pupilo Meter

[sandeepgoodbole]

Hi !
Please tell me how a pupilometer works ?
Does it marks the Pupil Centres on the Demo of the frame ?

[Chris Ryser]

sandeepgoodbole said:
Hi !
Please tell me how a pupilometer works ?
Does it marks the Pupil Centres on the Demo of the frame ?

Which one do you mean? I found one that also does other things, here is the text


EYECHECK™ pupillometer is a lightweight, hand-held instrument that measures ABSOLUTE pupil dynamics to presumptively detect drugs and intoxicating compounds….. With immediate results.

A valuable tool in the fields of:
Law Enforcement, Corrections
Probation & Parole Drug Testing
Transportation, Private Employment Testing
You can screen for human impairment without having to handle hazardous body fluids. The EyeCheck™ pupillometer is:

Non-invasive
Portable
User-friendly with a PASS/FAIL indicator
Cost effective.
No recurring costs. Pennies per test.
No Baseline necessary.

It's easy to use...
An individual simply peers into the unit's viewing area. A light flashes, and the pupil reacts to that stimuli, causing constriction and then re-dilation of the pupil.


EyeCheck™ pupillometer tracks the pupil's reaction response to a light stimuli.

The pupillary dynamics are collected, recorded, and stored.

The data is then processed and the results are displayed on your computer screen.

The displayed data indicates a PASS/FAIL results.

[shanbaum]

Sure, but does it measure the P.D.?

[WTR180]

Marks the Pupil's centers on the demo lenses in the frame????

Doesnt sound like any pupilometer I have ever used.

A pupilometer replaces the PD stick for measuring the patients PD. Which is always up for debate for where the patient is to be looking when you do the measurement.

[chip anderson]

Sandeep:

It measures the interpupillary distance of the pupillary reflection, does not mark frame. Measures each eye individually read from a dial or some of the newer ones are digital. Can be set to measure interpupilary distances from infinity to about 25 cm. So you can measure for unusual near focal lengths.

Chip

Will send picture to you by E. Mail if I remember to take picture next week.

[sandeepgoodbole]

chip anderson said:
Sandeep:

It measures the interpupillary distance of the pupillary reflection, does not mark frame. Measures each eye individually read from a dial or some of the newer ones are digital. Can be set to measure interpupilary distances from infinity to about 25 cm. So you can measure for unusual near focal lengths.

Chip

Will send picture to you by E. Mail if I remember to take picture next week.

Thanks a lot , Chris, Guru Shanbaum,WRT180 and Chip,

Please tell me how this helps in Marking the Centre of the Pupil as requierd for PALs. If it does not, then please elaborate the procedure to mark the Eye Centres on Demo with foolproof accuracy.

[shanbaum]

sandeepgoodbole said:
Thanks a lot , Chris, Guru Shanbaum,WRT180 and Chip,

Please tell me how this helps in Marking the Centre of the Pupil as requierd for PALs. If it does not, then please elaborate the procedure to mark the Eye Centres on Demo with foolproof accuracy.

It doesn't, other than to provide a more-or-less objective reference - that is, if the marks on the demo lens don't match the pupillometer measurement, you probably need to try again.

I never did this much, but I believe the preferred way of marking fitting locations on demo lenses is to reflect a penlight off the cornea and dot that point.

One problem I always had with this technique (and most other PD measuring techniques) is that since the alignment is invariably done one eye at a time, and because I couldn't render myself invisible, I was never confident that I was causing the patient to simulate a distance gaze. That is, I always suspected that I was really taking my P.D. as opposed to the patient's; or something between our two P.D.'s.

And while pupillometers may claim objectivity, there are those who argue that they have an inherent deficiency: somthing called proximal convergence, which asserts that the eyes converge whenever there's an object close up in front of them.

Of course, a guy who's been at this as long as Uncle Chip can take a P.D. just by glancing at the patient when he walks in the door!

[chip anderson]

Sandeep:

For progressive bifocals without pupilometer:

1)Important: Have patient close the fellow eye. 1 measure the distance for P.D. one eye at a time . You know light at arm's lenght and reflection to center of nose. Add 1 mm for distance for convergence subtract 1 mm from same for near for lack of full convergence.
2) Dot both lenses, draw a straight line across lenses connecting the dots.
3) Important: Have patient stand up, look at a distant object (aproximately eye level). Tell patient to stand in a relaxed (non-proped up, not "at attention") stance. See if the line you have drawn bicects the pupil. The line drawn while the patient will often not be the same when patient is standing. Use the standing measurment.

Chip

[sandeepgoodbole]

You are simply great !


Chip Chip Hurry !
3 :cheers:

[sandeepgoodbole]

Jay Gurudev !
You have rightly described my unease exactly as I feel.
So, I am not the only one to feel so !
Also, like everybody over here, religeously belive what you have said about Chip Uncle.
Thanks a lot !