I brought these pair of glasses from Zenni in the January 19, 2023. I specifically picked this pair because I liked the design as well as I no longer had to deal with the an adjustable nose pad that typical comes with a metal frame. There were a few rare incident where I have misplaced my glasses and stepped on my glasses and mess up the nose pad and readjust it never quite right. It was either too much pressure on one side or the nose pad would be too loose and constant slip down. With these pair of glasses I no longer had to dial in the nose pad to fit just right. However, the frame being so heavy, whenever I looked down, these pair would also slip down my nose. I fixed the issue by buying a strap to hold the end piece so it couldn’t slip down any more. No other issues.
I got do redo my eye exam and with that comes a new prescription, and I didn’t want to change my glasses frame so I reorder from Zenni the same pair on July 2, 2025. There weren’t anything wrong with the glasses under til recently. The screws holding in place the nose pad would come loose and fall off. The first time it happen I thought because I had clean the nose pad by unscrewing it then when I screw it back on I must of not tighten the screw enough. However, the other day, when I was finish up my workout of jump roping I took off my glasses to wipe my sweat and again it happen the screws complete unloose and fell off. I was fortunate enough to be home where the floor was hard wood so I could easily find the missing screw. Had it been else where, finding my missing screw would be finding a needle in a hay stack. It was annoying, but I didn’t think much of it.
Today, I thought of a solution to the problem to resolve the screw from coming loose, I had some spare blue thread locker that I could apply and hopefully prevent the screw from coming loose. I wanted to swap my old glasses screws and nose pad while I apply the thread locker to the new screws so I could still use my glasses while I wait til it drys. But that’s when I noticed the old screws from the older frame seem longer than the new ones. Luckily for me, I have caliper to measure to see whether or not there was a difference.
Old screws
A. 2.3241 mm = .0915 in
B. 2.3241 mm = .0915 in
New screws
A. 2.2225 mm = .0875 in
B. 2.2479 mm = .0885 in
Difference
A. .1016 mm = .0004in
B. .0762 mm = .0003in
I think for people that don’t do much intense cardio it would be a non issue. But for me, I try to do cardio of jump rope 20 min everyday, and cycle for grocery every now and then. I never had any issues with the older frame with the nose pad screw coming loose and falling off. I have probably have done more cardio with my older glasses and never has it once fallen off. Never. Thankfully, because I still have my old frames I can simply swap the new shorter screw with the old longer screw.
TL;DR – Newer pair of glasses nose pad keeps falling off because the newer screws are shorter than the old ones. Paid about the same price for them to cut corners off a few MM in the screws.