Tint

[Mizikal]

Trying to find out the affect a brown 3 lens has on vision acuity. I looked up tinted lenses in System for Opthalmic Dispening and it only gave visual acuity for a pink lens and night driving sayd it is 20/40.I have a guy who wants darker lenses. I just want to be able to tell him why I cannot make them any darker.

[rinselberg]

Have you considered taking a demo lens or a scrap lens of some kind and tinting it to brown-3 and then actually demonstrating how unsuitable it would be to the patient?

Just a thought ...

Invest in a nighttime driving simulator for your patients ... :hammer:

[Chris Ryser]

.........................night driving sayd it is 20/40.I have a guy who wants darker lenses. I just want to be able to tell him why I cannot make them any darker.

Replace the light switch in a windowless room with a dimmer and get the room dark for a good night test demonstration.

[optilady1]

Are you able to take the patient into the exam room and turn the lights down, and have him try to read something? All you'd have to do is put a non-rx sun on and look at a poster or something.

[kcount]

A Brown 3 lens filters aproximately 88% of visible light allowing aprox 12% of light to pass through to the eye. the interesting part to brown is its ability to band some colors and suppress others. So, red and green (650nm and 510nm respectively) ar seen by the viewer as 'enhanced'. We would call that a banding effect, the colors are now 'popping' great certainly if your driving and fall colors are certainly enhanced. The wave lengths of 450-480nm are filtered out! This is color supression and is often times refferd to as a nedymnium property. This filtering and banding can be enhanced further with the addition of red (or Pink) to a brown based lens. This color mixing would result in a lens similar to a Serengetti Driver or the Maui Rose lens. Interestingly, the same phenomema of color banding and supression aslo occurs in a G-15 lens, albeit to a lesser extent. How cool is that! Grey lenses of course remove the most light allowing typically 10% of light to pass and effect color the least. The concern to grey lenses as they are commonly blue based and can, in some instances, cause a hazing effect. This hazing effect is due to the human eye having fewer blue color receptors than red and green. If you want to see this all in action simply shine a light through a glass prism to create a color spectrum, then hold a colored lens ray of light.

As far as making the lens darker than Brown 3, if its a tinted lens, I'd be comfortable going all the way out to a Glacier Glass (5% transmition) although thats a mighty dark lens. If this person wants to use these for night driving I'd site safety concerns and refuse.

If you want a site to play with what the light transmission is on which color, Oakley has a nice page for this here.

Hope this all helps if you need more let me know. I can drone on and on when it comes to this.

KC

[Uilleann]

Rēvo *used* to have one of the best website demonstrations of spectrum banding with their own lenses - at least until the huge bloated disgusting and horrible monster that is Luxottica bought them, and utterly slaughtered the brand outright!!! There - did I use the appropriate amount of venom as all the E haters do? Just wanna know I can still fit in around here! HAHAHA :hammer::shiner:

[optilady1]

A Brown 3 lens filters aproximately 88% of visible light allowing aprox 12% of light to pass through to the eye. the interesting part to brown is its ability to band some colors and suppress others. So, red and green (650nm and 510nm respectively) ar seen by the viewer as 'enhanced'. We would call that a banding effect, the colors are now 'popping' great certainly if your driving and fall colors are certainly enhanced. The wave lengths of 450-480nm are filtered out! This is color supression and is often times refferd to as a nedymnium property. This filtering and banding can be enhanced further with the addition of red (or Pink) to a brown based lens. This color mixing would result in a lens similar to a Serengetti Driver or the Maui Rose lens. Interestingly, the same phenomema of color banding and supression aslo occurs in a G-15 lens, albeit to a lesser extent. How cool is that! Grey lenses of course remove the most light allowing typically 10% of light to pass and effect color the least. The concern to grey lenses as they are commonly blue based and can, in some instances, cause a hazing effect. This hazing effect is due to the human eye having fewer blue color receptors than red and green. If you want to see this all in action simply shine a light through a glass prism to create a color spectrum, then hold a colored lens ray of light.

As far as making the lens darker than Brown 3, if its a tinted lens, I'd be comfortable going all the way out to a Glacier Glass (5% transmition) although thats a mighty dark lens. If this person wants to use these for night driving I'd site safety concerns and refuse.

If you want a site to play with what the light transmission is on which color, Oakley has a nice page for this here.

Hope this all helps if you need more let me know. I can drone on and on when it comes to this.

KC

This is the best post. I learned a lot reading it. Thank you. I don't remember in my basic optics class anything so straight forward as to why brown and grey are different (other than the obvious). Thanks again!

[Mizikal]

A Brown 3 lens filters aproximately 88% of visible light allowing aprox 12% of light to pass through to the eye. the interesting part to brown is its ability to band some colors and suppress others. So, red and green (650nm and 510nm respectively) ar seen by the viewer as 'enhanced'. We would call that a banding effect, the colors are now 'popping' great certainly if your driving and fall colors are certainly enhanced. The wave lengths of 450-480nm are filtered out! This is color supression and is often times refferd to as a nedymnium property. This filtering and banding can be enhanced further with the addition of red (or Pink) to a brown based lens. This color mixing would result in a lens similar to a Serengetti Driver or the Maui Rose lens. Interestingly, the same phenomema of color banding and supression aslo occurs in a G-15 lens, albeit to a lesser extent. How cool is that! Grey lenses of course remove the most light allowing typically 10% of light to pass and effect color the least. The concern to grey lenses as they are commonly blue based and can, in some instances, cause a hazing effect. This hazing effect is due to the human eye having fewer blue color receptors than red and green. If you want to see this all in action simply shine a light through a glass prism to create a color spectrum, then hold a colored lens ray of light.

As far as making the lens darker than Brown 3, if its a tinted lens, I'd be comfortable going all the way out to a Glacier Glass (5% transmition) although thats a mighty dark lens. If this person wants to use these for night driving I'd site safety concerns and refuse.

If you want a site to play with what the light transmission is on which color, Oakley has a nice page for this here.

Hope this all helps if you need more let me know. I can drone on and on when it comes to this.

KC

That is what I needed to know. Thank you very much.

[chip anderson]

Optichampus has some excellent information and charts.

[kcount]

Happy to help.

[Wes]

This is the best post. I learned a lot reading it. Thank you. I don't remember in my basic optics class anything so straight forward as to why brown and grey are different (other than the obvious). Thanks again!

Here's another thread discussing similar issues.

http://www.optiboard.com/forums/show...027#post371027