HWZ Forums

Login Register FAQ Mark Forums Read

The Spectacles Thread. - Part 2

Like Tree479Likes
Reply
 
LinkBack Thread Tools
Old 30-06-2019, 02:11 PM   #5761
Arch-Supremacy Member
 
tortoise18's Avatar
 
Join Date: Apr 2005
Posts: 23,407
If going for Brand: Essilor
Comfort/value for money: Neither

🤭We don't like selling branded when there are better lenses around
U sell lenses? Can advise whether crizal prevencia, zeiss blue protect or kodak uv blue best? Don't want yellow tint.
tortoise18 is online now   Reply With Quote
Old 30-06-2019, 02:12 PM   #5762
Senior Member
 
Join Date: Jan 2003
Posts: 513
They are really comparable to the other lens of similar tier. You can consider trying it honestly.
May I know how you find that it is comparable? Eg, Is it based on some scientific measure, customer feedback/returns, you tried it yourself, ...?
salmonella is offline   Reply With Quote
Old 30-06-2019, 02:36 PM   #5763
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103
Based on customer feedback and imptly, from my colleagues who are older than me that tries such lenses on constant basis. I am not at that stage yet haha.

May I know how you find that it is comparable? Eg, Is it based on some scientific measure, customer feedback/returns, you tried it yourself, ...?
salmonella likes this.
GANGSTERKIA is online now   Reply With Quote
Old 30-06-2019, 02:37 PM   #5764
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103
Yes it helps to reduce glare.

Gimmick would be to say it prevents cataract and such, as not enough studies can prove that currently.

For someone who is facing the computer/phone screen alot, is the anti-blue light lens useful?

Or it is just a marketing gimmick
GANGSTERKIA is online now   Reply With Quote
Old 01-07-2019, 08:53 PM   #5765
Member
 
Join Date: May 2018
Posts: 207
U sell lenses? Can advise whether crizal prevencia, zeiss blue protect or kodak uv blue best? Don't want yellow tint.
Crizal Prevencia & Zeiss BlueProtect uses a Blue Coating to reflect blue Light. These lenses usually appear much more yellowish than normal.

Kodak UVblue has HEV(Blue) Filter properties inbuilt into the material, this lens will have a more natural view.

__________________
Eye Zone Optical-since 1997
Top Optical Chain in Singapore with most 5⭐ google Review
EyezoneOpticalSG is online now   Reply With Quote
Old 01-07-2019, 09:07 PM   #5766
Member
 
Join Date: May 2018
Posts: 207
Yes it helps to reduce glare.

Gimmick would be to say it prevents cataract and such, as not enough studies can prove that currently.
Hmm quite a number of recent studies supporting the notion "High Energy Visible light in the wavelength ~410nm-455nm causing early occurance of Cataract & AMD"

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288536/
https://www.aoa.org/Documents/CRG/Bl...e%20Damage.pdf
https://www.preventblindness.org/blu...-and-your-eyes
https://opto.ca/health-library/blue-...e-risk-of-harm

__________________
Eye Zone Optical-since 1997
Top Optical Chain in Singapore with most 5⭐ google Review
EyezoneOpticalSG is online now   Reply With Quote
Old 01-07-2019, 09:21 PM   #5767
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103
Ah, over-exposure to blue light does “factor” in the formation of cataract. Main causes would be still over-exposure to UV light, smoking, diet.

I mentioned that it is a gimmick to say it “PREVENTS” cataract or even AMD. Users at older age would be recommended more for such protection feature. For individuals like myself who are in the 20s mainly uses it to reduce glare. Blue light lenses does not prevent but may reduce chances of formation.

Also most articles usually mention the common cause of cataract formation or even AMD is due to Ageing and of course the usual exposure to UV.

To clarify any misunderstanding, overexposure to blue light is a factor that might accelerate the formation of cataract but not the main case. That does not mean blue light is bad as again from the articles, we need blue light for our body to function day to day, sleeping routine and more.

Hmm quite a number of recent studies supporting the notion "High Energy Visible light in the wavelength ~410nm-455nm causing early occurance of Cataract & AMD"

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288536/
https://www.aoa.org/Documents/CRG/Bl...e%20Damage.pdf
https://www.preventblindness.org/blu...-and-your-eyes
https://opto.ca/health-library/blue-...e-risk-of-harm

GANGSTERKIA is online now   Reply With Quote
Old 01-07-2019, 09:37 PM   #5768
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103
Hmm quite a number of recent studies supporting the notion "High Energy Visible light in the wavelength ~410nm-455nm causing early occurance of Cataract & AMD"

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288536/
https://www.aoa.org/Documents/CRG/Bl...e%20Damage.pdf
https://www.preventblindness.org/blu...-and-your-eyes
https://opto.ca/health-library/blue-...e-risk-of-harm


https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288536/
Article 1:Retina is the initial site of vision formation, and it is also the lesion site of various blinding eye diseases. It plays an important role in preventing blindness. Blue light can penetrate through lens to the retina and cause retinal photochemical damage. At present, there are relatively many studies on blue light's effects on the retina, but they are still being debated.

Quote 2:The results show that screen reading can lead to the occurrence and development of poor eyesight in schoolchildren, and the higher incidence of nearsightedness correlates with the increase in the length of the screen reading time[31]. From the difference between screen reading and outdoor activities, we found that outdoor activities are exposed to natural light, which is more concentrated in short-wave blue light than other artificial light sources. The study of Rucker et al[32] suggested that sunlight is much richer in short-wavelength light than most artificial illuminants, which turned to reduce the eye length through the mechanism of retinal dopamine release. In addition, the research also showed that blue light was essential for the reduction in astigmatism during development.



Article 2: Their results showed that persons who reported more than five hours a day of summer sun exposure in their teens, in their 30s, and at the baseline examination, had a higher risk of developing retinal changes indicative of early age-related maculopathy than those exposed for less than two hours per day. Additionally, for those showing the high outdoor exposures, using a hat or sunglasses decreased the risk of early ARM changes by nearly 50 percent.
Also(edit)Most electronic displays and our newer residential light sources (CFLs and LEDs) have substantially greater blue light production than traditional incandescent sources. Also, a Harvard researcher (Lockley 2007) has recommended that blue-blocking sunglasses should not be recommended for night shift workers driving home from work as the early morning blue light from the sun would be advantageous to increase alertness. The same argument would apply to anyone driving with less than desired alertness

Link 3/4:It's more of an general website page which takes its information from compiled studies. Viable.

Once again, i agree with you that blue light might factor in eye diseases in the future,studies are still ongoing thus UV-protection is the No.1 need and for blue light, it is subjective whether the individual patient needs it or not.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288536/
https://www.aoa.org/Documents/CRG/Bl...e%20Damage.pdf
https://www.preventblindness.org/blu...-and-your-eyes
https://opto.ca/health-library/blue-...e-risk-of-harm

Last edited by GANGSTERKIA; 01-07-2019 at 11:50 PM..
GANGSTERKIA is online now   Reply With Quote
Old 01-07-2019, 09:42 PM   #5769
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288536/
Article 1:Retina is the initial site of vision formation, and it is also the lesion site of various blinding eye diseases. It plays an important role in preventing blindness. Blue light can penetrate through lens to the retina and cause retinal photochemical damage. At present, there are relatively many studies on blue light's effects on the retina, but they are still being debated.

Quote 2:The results show that screen reading can lead to the occurrence and development of poor eyesight in schoolchildren, and the higher incidence of nearsightedness correlates with the increase in the length of the screen reading time[31]. From the difference between screen reading and outdoor activities, we found that outdoor activities are exposed to natural light, which is more concentrated in short-wave blue light than other artificial light sources. The study of Rucker et al[32] suggested that sunlight is much richer in short-wavelength light than most artificial illuminants, which turned to reduce the eye length through the mechanism of retinal dopamine release. In addition, the research also showed that blue light was essential for the reduction in astigmatism during development.



Article 2: Their results showed that persons who reported more than five hours a day of summer
sun exposure in their teens, in their 30s, and at the baseline examination, had a higher risk of
developing retinal changes indicative of early age-related maculopathy than those exposed for
less than two hours per day. Additionally, for those showing the high outdoor exposures, using a
hat or sunglasses decreased the risk of early ARM changes by nearly 50 percent.

Link 3/4:It's more of an general website page which takes its information from compiled studies. Viable.

Once again, i agree with you that blue light might factor in eye diseases in the future,studies are still ongoing thus UV-protection is the No.1 need and for blue light, it is subjective whether the individual patient needs it or not.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288536/
https://www.aoa.org/Documents/CRG/Bl...e%20Damage.pdf
https://www.preventblindness.org/blu...-and-your-eyes
https://opto.ca/health-library/blue-...e-risk-of-harm

Edit:for those wondering about such lenses, it is an extra protection for you to choose the blue light lenses, but it take note, do not confuse ANTI-blue light and blue light filter. These lenses still allows blue light to go through, just significantly lesser.
Blue light is not necessarily a bad thing, just that *re-emphasize* over-exposure could be a potential hazard.
GANGSTERKIA is online now   Reply With Quote
Old 02-07-2019, 01:55 PM   #5770
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103


First image is a normal blue light reflect lenses to show how much hev is filtered.
Second image is a normal blue light absorb lenses.
It will not be 100% or else whatever you see is just yellow.
GANGSTERKIA is online now   Reply With Quote
Old 03-07-2019, 08:51 AM   #5771
Junior Member
 
Join Date: Feb 2008
Posts: 11
Any optical shop recommendation near Farrer road/Tan Kah Kee MRT?

Hi,
Any optical shop recommendation near Farrer road/Tan Kah Kee MRT?
I want to have a pair of progressive lenses.

Thank you!
cmos196 is offline   Reply With Quote
Old 03-07-2019, 11:37 AM   #5772
Member
 
Join Date: May 2018
Posts: 207


First image is a normal blue light reflect lenses to show how much hev is filtered.
Second image is a normal blue light absorb lenses.
It will not be 100% or else whatever you see is just yellow.
Hmm Why does your Blue absorb lenses filter out only 17% HEV light?

This demostration by Tokai showing their Lutina filtering out quite alot🤭
https://www.youtube.com/watch?v=XJYvnyAharM


Btw, a quick explanation of HEV(High Energy Visible) light vs blue light.

Blue light generally is defined as visible light ranging from 380 to 500nm.
HEV is part of the blue light spectrum ranging from ~400-450nm.

The lower the wavelength, the higher the energy it has, the more damages it does to the eyes.

Blocking all blue light is not good as blue light is essential for our daily activities. But excessive HEV light from any light source is not good for the eyes though.

End of day, its up to our own interpretation of materials/studies available around.
__________________
Eye Zone Optical-since 1997
Top Optical Chain in Singapore with most 5⭐ google Review

Last edited by EyezoneOpticalSG; 03-07-2019 at 11:44 AM..
EyezoneOpticalSG is online now   Reply With Quote
Old 03-07-2019, 12:12 PM   #5773
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103
This demonstration is just to show the blue light being filtered out which all blue light absorb lens is able to do.


Second picture look at the faint purplish dot not the brighter one.
UVA,UVB is 100% blocked off. UVC is mostly absorbed from our atmosphere. UVA is the one that is instrumental in development of eye diseases. Thus as I mention, it is a gimmick to say it prevents but more of just slowing down or just extra protection. It still lies on the individual body resistance. I believe we seen many individuals without such protection at old age with heathy eyes too.
Yes it is impt to understand the studies and reading and more research has to be done to reach a conclusive statement. Until it is confirmed, we can’t give a definitive statement.


Hmm Why does your Blue absorb lenses filter out only 17% HEV light?

This demostration by Tokai showing their Lutina filtering out quite alot🤭
https://www.youtube.com/watch?v=XJYvnyAharM


Btw, a quick explanation of HEV(High Energy Visible) light vs blue light.

Blue light generally is defined as visible light ranging from 380 to 500nm.
HEV is part of the blue light spectrum ranging from ~400-450nm.

The lower the wavelength, the higher the energy it has, the more damages it does to the eyes.

Blocking all blue light is not good as blue light is essential for our daily activities. But excessive HEV light from any light source is not good for the eyes though.

End of day, its up to our own interpretation of materials/studies available around.
GANGSTERKIA is online now   Reply With Quote
Old 03-07-2019, 12:15 PM   #5774
Master Member
 
GANGSTERKIA's Avatar
 
Join Date: Oct 2010
Posts: 3,103
I


A better indication where to look at. Inside the Teal circle. Can you spot it?

P.S. I am not trying to say which brand is better as I’m neutral. But I just need to share that blue light filter lens has it’s own pros and cons and not everyone needs it.
And if they need, blue light reflect and blue light absorbs have their own pros and cons too. Doesn’t mean lesser light go through the lens and it is the better one.

Last edited by GANGSTERKIA; 04-07-2019 at 11:56 AM.. Reason: edited in bold.
GANGSTERKIA is online now   Reply With Quote
Old 03-07-2019, 06:59 PM   #5775
Junior Member
 
Join Date: Mar 2019
Posts: 12
is it normal that my vision through the crizal eyezen is only clear when i look through it in the middle? And it gets blurry when i roll my eyes to the left or right? Blurry also when i roll my eyes to look at stuff through the top of the lens?
shenjingbing is offline   Reply With Quote
Reply
Important Forum Advisory Note
This forum is moderated by volunteer moderators who will react only to members' feedback on posts. Moderators are not employees or representatives of HWZ. Forum members and moderators are responsible for their own posts.

Please refer to our Terms of Service for more information.


Thread Tools

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On