Results 1 to 9 of 9

Thread: ARC Coatings and Computer Reflection

  1. #1
    OptiBoard Novice
    Join Date
    Jul 2020
    Location
    Austin, Texas
    Occupation
    Optical Retail
    Posts
    1

    ARC Coatings and Computer Reflection

    Recently, I started working as a sales associate at a local optical store. It has been difficult trying to work during the pandemic, but I've been greatly enjoying the experience and working with all the patients.

    The business has declined as a result of COVID, and the owner cut our optician's hours and I barely see her. As a result it has been difficult to get answers to the patients' questions.

    This site has been an amazing resource for me since I started working in the optical field. I'm hoping I might be able to get some help answering a common patient question.

    Many of our patients are working from home and using Zoom to take calls. Several have complained that they are seeing the reflection of the computer screen in their image on the Zoom call. The customers don't have glare, and do not notice the reflection until they see their faces on the Zoom call. However, the reflection is very prominent and some of their colleagues complain it is distracting. Most patients say the reflection is green in color.

    I took a look at the customers' files, and all of them have some type of ARC coating on their glasses (most have Crizal Avance, but some have Crizal Alize).

    Do you know why this is happening, and if there is anything we can do to solve the problem? Would remaking the glasses using Crizal Sapphire or a different ARC coating solve the problem?

    Note that most of my customers have Davis, so we are limited in using many "high-end" ARC coatings.

  2. #2
    OptiBoard Professional Mauro.Airoldi's Avatar
    Join Date
    May 2007
    Location
    Bologna Italy
    Occupation
    Lens Manufacturer
    Posts
    161
    AR is, as the name implies, a treatment that reduces the reflex but does not eliminate it.
    the fact of noticing this reflection on the lenses during a teleconference depends on the shape (curve) of the glasses and mainly on the presence of light sources that are reflected in the lens and therefore is read by the camera.
    simple solution, reduce the brightness of the lamp or change the angle of incidence (just rotate the desk a few degrees).
    one type of AR or another does not vary much the problem

  3. #3
    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
    Join Date
    Dec 2004
    Location
    At a position without dimension...
    Occupation
    Dispensing Optician
    Posts
    5,300
    A deep dive on AR.

    Note Esiilors guru Pete Hanlon's post #8:

    https://www.optiboard.com/forums/sho...ual+reflection

  4. #4
    Master OptiBoarder
    Join Date
    Feb 2013
    Location
    PA
    Occupation
    Dispensing Optician
    Posts
    1,607
    Quote Originally Posted by Mauro.Airoldi View Post
    AR is, as the name implies, a treatment that reduces the reflex but does not eliminate it.
    the fact of noticing this reflection on the lenses during a teleconference depends on the shape (curve) of the glasses and mainly on the presence of light sources that are reflected in the lens and therefore is read by the camera.
    simple solution, reduce the brightness of the lamp or change the angle of incidence (just rotate the desk a few degrees).
    one type of AR or another does not vary much the problem
    +1 agreed

  5. #5
    Master OptiBoarder
    Join Date
    Jun 2012
    Location
    Mitten State
    Occupation
    Ophthalmic Technician
    Posts
    713
    So, reduce the brightness of the LCD screen. Makes sense to me.

    Would adding a polarized filter to the camera help? (I'm think yes, since the reflection should be unpolarized light. One would probably need to provide ample ambient light to compensate for the loss due to polarization, but it should be a simple task to do so.)
    Last edited by Lelarep; 07-29-2020 at 12:44 PM.

  6. #6
    OptiBoardaholic OptiBoard Bronze Supporter
    Join Date
    Jan 2017
    Location
    USA
    Occupation
    Dispensing Optician
    Posts
    216
    Quote Originally Posted by Lelarep View Post
    Would adding a polarized filter to the camera help? (I'm think yes, since the reflection should be unpolarized light. One would probably need to provide ample ambient light to compensate for the loss due to polarization, but it should be a simple task to do so.)
    The average persons webcam setup usually does not allow for adding filters. Cheap polarizing filters for smartphones/tablets might add an undesirable colorcast that might be more annoying than the reflections.

  7. #7
    Master OptiBoarder
    Join Date
    Jun 2012
    Location
    Mitten State
    Occupation
    Ophthalmic Technician
    Posts
    713
    A simple polarizing film should just reduce the incoming light, which one could compensate for. I don't see why it would produce a colorcast since all it is doing is polarizing the light. Humans, and a camera, would both perceive polarizing film as a neutral gray due to light intensity reduction, compared to the same image without the film present.

  8. #8
    OptiBoard Professional Mauro.Airoldi's Avatar
    Join Date
    May 2007
    Location
    Bologna Italy
    Occupation
    Lens Manufacturer
    Posts
    161
    Quote Originally Posted by Lelarep View Post
    A simple polarizing film should just reduce the incoming light, which one could compensate for. I don't see why it would produce a colorcast since all it is doing is polarizing the light. Humans, and a camera, would both perceive polarizing film as a neutral gray due to light intensity reduction, compared to the same image without the film present.
    this is not the case, the molecules that give polarization have the characteristic of absorbing a little light on all angles anyway. if you accept a 95% polarization on 90 ° angles, you will still have a generic light absorption effect of the average of 35/50%
    we also consider that commercially the polarized product is expressly sold for sun lens use. therefore the target is precisely that of a lens with a high absorption of light (75/85%), while commercial products have not been studied for indoor use.

  9. #9
    Master OptiBoarder
    Join Date
    Jun 2012
    Location
    Mitten State
    Occupation
    Ophthalmic Technician
    Posts
    713
    Quote Originally Posted by Mauro.Airoldi View Post
    this is not the case, the molecules that give polarization have the characteristic of absorbing a little light on all angles anyway. if you accept a 95% polarization on 90 ° angles, you will still have a generic light absorption effect of the average of 35/50%
    we also consider that commercially the polarized product is expressly sold for sun lens use. therefore the target is precisely that of a lens with a high absorption of light (75/85%), while commercial products have not been studied for indoor use.
    Um, I'm talking about a polarizing film like one would put on a computer screen, not a lens.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Glasses for computer professional/ heavy computer users
    By j4jugnoo in forum General Optics and Eyecare Discussion Forum
    Replies: 1
    Last Post: 09-30-2017, 10:38 AM
  2. computer lenses and anti-reflective coatings
    By jbrian00 in forum General Optics and Eyecare Discussion Forum
    Replies: 10
    Last Post: 07-29-2008, 03:16 PM
  3. Anitreflective coatings and UV coatings
    By psykosis in forum General Optics and Eyecare Discussion Forum
    Replies: 12
    Last Post: 03-18-2007, 08:03 PM
  4. "Generic AR coatings vs. Premium AR coatings"
    By misunderstood in forum General Optics and Eyecare Discussion Forum
    Replies: 1
    Last Post: 08-26-2005, 08:47 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •