Does anyone know in the marking up of an Access lens is the add power marking nasally or temporally? Our lab keeps making the lens reversed and the patient can't see. Any ideas? Thanks!
Does anyone know in the marking up of an Access lens is the add power marking nasally or temporally? Our lab keeps making the lens reversed and the patient can't see. Any ideas? Thanks!
One of the few that add is nasal according to my 2011 OLA book.
Save this site for future reference and click on this pages "centration chart" to see the markings---
http://www.thelensguru.com/quikref.p...ef_lens=access
The chart is misleading as it asks you to place the frame on the chart so it would appear the add is temporal.
Last edited by Uncle Fester; 10-11-2012 at 01:34 PM. Reason: edit after closer examination of chart...
Thanks much!!
Access uses the same lens design for both the right and left eyes, so there really is no "nasal" or "temporal" side. The power range is always located under the right semi-visible logo engraving, as seen from the front of the lens, which would correspond to the nasal side of right lenses and the temporal side of left lenses.
Best regards,
Darryl
Darryl J. Meister, ABOM
Thanks for the clarification Darryl. As you might have guessed I haven't used the lens. For computers I try to talk patients into sv usually backed off .50 or.75 from the distance rx.
Glad to help.
Best regards,
Darryl
Darryl J. Meister, ABOM
What is it that they are not "seeing"?Originally Posted by Mary28
Eyes wide open
Vision is blurry in the intermediate and near. After looking at the lens, I thought it was cut wrong because the add power was nasally so I sent it back to the lab. The lab informed me that it was ok. However, the patient still suffers blurry vision in her right eye and we sent her back for an Rx check which was fine. We are still working on this problem here. (I am a Newbie in the optical field, btw). Thanks for all help.
A few things to check, after marking the lenses up using an Access Centration chart:
Did you verify that the reading power of the lenses was fabricated correctly (below the near "arc")?
Was the correct Access power range chosen?
Is the distance between the prism reference or layout point of each lens equal to the wearer's near PD?
Is the prism reference or layout point of the lens at or within 5 mm below the pupil?
Does the vision clear up when the head is raised or lowered, moved right or left?
It would also be helpful to us for you to post a few details concerning the job, including the prescription, when troubleshooting.
Best regards,
Darryl
Darryl J. Meister, ABOM
Thanks, Darryl. Will get on the ball. It all helps.
Thanks, Mary28....and welcome to the forum. Please post back with the outcome of your findings, so that future troubleshooters will be armed with the information.
Besides, inquiring minds wanna know!
Eyes wide open
Clearly a rookie mistake. I used distance monocular pds instead of near pds. Also, I am supposed to measure 4mm down below pupil center which I didn't do. The patient came in and was very happy with the outcome.
Glad to hear that you sorted it out to the patient's satisfaction. Using the distance PD is an easy enough mistake to make, since the fitting recommendations of computer and enhanced near lenses like Access vary from lens manufacturer to lens manufacturer...Clearly a rookie mistake. I used distance monocular pds instead of near pds. Also, I am supposed to measure 4mm down below pupil center which I didn't do. The patient came in and was very happy with the outcome.
Best regards,
Darryl
Darryl J. Meister, ABOM
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