so if i don't know the difference between one & two does that mean i don't have estigmatism? last time at my eye exam i really couldn't tell the difference but i still picked a number i thought was best cus i didnt think them being the same was an option.. it was just confusing
Hi, can you please give me a conversion of what -6 is in the measurement of 20/XXX or 6/XXX is? I know what these measurements mean, where as -6 gives no real perspective. My partner is nearsighted -6, and can only see clear 25-30cm in front if without glasses on. But even so he seems to not see that well, even in this short field, has to read a large, lit mobile phone screen with 1cm fonts at only 2cm to see it, without glasses on. Of course at this distance had to look at it from one eye.
@squelch9 If you know what a Jackson Cross Cylinder lens is, you know more than most My videos are not instructional for people studying optometry or optics, they are for people curious about their eye exam and what to expect. If you want a description of of the JCC, go back to class or pick up a copy of Borish's Clinical Refraction. I graduated from the New England College of Optometry.
@MAnGaThaBOy First of all, this is a public forum so there is no need to use such "aggressive" language, so I will answer your question but I am going to remove your comment in a couple days. Second, the answer to your question is as they say, complicated. It takes more space than what I have here to answer, I tried. i can respond with a message to you. Possibly this is a good topic for a video. Thanks for the question.
This was good information to know for my next eye test. I didn't know that you guys were looking for the point where both appeared the same to us. Now I know how I can help out to make sure that the best info is made available to the doc.
@lenoat702 If your eyes and brain have the capacity to distinguish detail smaller than 20/20 then yes, you should see better than 20/20. It is quite common actually.
@lenoat702 Yes! In fact some retinas have the capability of 20/18 and 20/15. The OD will prescribe for Best-Visual-Acuity -- so you automatically get the "Best" vision through a strong minus lens. Some ODs will not over-prescribe like this, but will provide a lens that gives you 20/20. The difference can be 1/2 to 3/4 diopters.
a little confused, how to use JCC, how do i know it's to refine the angle or to make sure is it dioptric power to high or too low??? would you please tell me, thank you...
I have noticed that if I tilt my glasses FORWARD my right eye long range vision improves, and the same for my left eye if I tilt them BACKWARDS. What has changed, nearsightedness or astigmatism?
@gimondix It may be that your prescription has changed a little bit. These optical tricks are fairly predictive. I am always suspicious that the astigmatism, however big or small, may need to be adjusted when some one comes in with the same experience. If the glasses(Rx) is new have it re-checked. If not, then it is time for an exam. The change may be pretty subtle though.
@justinsparhawk How long should i wear 1 month lenses? and please don't say one month cause that's fucking bullshit...eye doctors say that just to get more money.. i wear mine now 2 months without a problem keeping them clean, and i have no problem.Not going to wear them for 3 months , but is it ok to keep wearing them for 2? lenses are B&L.Tnx!
@gimondix it depends. If you have farsightedness and the eyeglasses you are currently wearing has insufficient grade, moving your eyeglasses forward will improve your longrangevision in your right eye.. If ever you have nearsightedness and the eyeglasses you are currently wearing has too much power than you actually needed now, moving your eyeglasses forward will improve your longrange vision also
I liked this video. I never knew there were micro adjustments being made so saying they looked the same was a good thing. I thought it was just all various lens you were going through and kept getting added.
My first eye doctor when i was a little kid was a fast talking Indian who would say "this or this, this or this, this or this..." way to fast for me to focus on either one and I'd say 'this' as he was changing it and he would move on to the next thing.
It looks like it takes about 10 percent of the time to determine the spherical refractive state, and 90 percent for "astigmatism". Good presentation. Thanks!
This is very interesting, to see the machine from the other side! Do you ever find that people can't tell you which one looks clearer, or more interestingly, that the angle of astigmatism changes during the exam or from one exam to another?
@HappyHag yes I find both of those. If some one can't tell the difference between two views I tend to give less power, knowing that when both eyes come together vision will be better anyway. As far as the angle changing during the exam, that is more difficult. I will use as much information as I can including past prescriptions, perceived vision with the past Rx, auto refraction... Then I will use the trial frame with loose lenses instead of the phoropter.
You are very welcome. Of course there are many other things it can do but 99% of the time we are looking at those three things. Thanks for the comment.
Thanks for showing us :D
Never tries one of those machines~
aurora9702 1 week ago
This is excellent information
salmanc1 2 weeks ago
so if i don't know the difference between one & two does that mean i don't have estigmatism? last time at my eye exam i really couldn't tell the difference but i still picked a number i thought was best cus i didnt think them being the same was an option.. it was just confusing
OxMarissa5x3 1 month ago
Eye exams r the best, they trigger my ASMR (google it).. Soooooo goood
frontliner0 1 month ago
Hi, can you please give me a conversion of what -6 is in the measurement of 20/XXX or 6/XXX is? I know what these measurements mean, where as -6 gives no real perspective. My partner is nearsighted -6, and can only see clear 25-30cm in front if without glasses on. But even so he seems to not see that well, even in this short field, has to read a large, lit mobile phone screen with 1cm fonts at only 2cm to see it, without glasses on. Of course at this distance had to look at it from one eye.
Pullisto 1 month ago in playlist nearsighted
I love making eye exam. I love the sound of the machines... :)
fernandatralala 2 months ago
Finally I've been wanting to know how this thing worked. Now I know and it's not all "1 and 2" there's really some numbers there. Optometry is cool.
IBMaccMartelli 2 months ago
Very informative. Thank you!!
tkdkicks2001 2 months ago
The JCC explanation is pretty vague and confusing, don't ya think, doc? From what opto school did you graduate?
squelch9 3 months ago
@squelch9 If you know what a Jackson Cross Cylinder lens is, you know more than most My videos are not instructional for people studying optometry or optics, they are for people curious about their eye exam and what to expect. If you want a description of of the JCC, go back to class or pick up a copy of Borish's Clinical Refraction. I graduated from the New England College of Optometry.
justinsparhawk 3 months ago
@MAnGaThaBOy First of all, this is a public forum so there is no need to use such "aggressive" language, so I will answer your question but I am going to remove your comment in a couple days. Second, the answer to your question is as they say, complicated. It takes more space than what I have here to answer, I tried. i can respond with a message to you. Possibly this is a good topic for a video. Thanks for the question.
justinsparhawk 4 months ago
At the begining 1 looked better.
SPS148669 5 months ago
Sorry to say this but this OD creeps me out
KristineMendoza13 5 months ago
@KristineMendoza13 Happy to oblige
justinsparhawk 3 months ago
This was good information to know for my next eye test. I didn't know that you guys were looking for the point where both appeared the same to us. Now I know how I can help out to make sure that the best info is made available to the doc.
wingmanx11 6 months ago
# One looks good. I have terrible eye strain and tired eyes and am calling an optometrist tomorrow.
shannonm75 6 months ago
Can you have glasses that make your vision better than 20\20?
lenoat702 7 months ago
@lenoat702 If your eyes and brain have the capacity to distinguish detail smaller than 20/20 then yes, you should see better than 20/20. It is quite common actually.
justinsparhawk 3 months ago
@lenoat702 Yes! In fact some retinas have the capability of 20/18 and 20/15. The OD will prescribe for Best-Visual-Acuity -- so you automatically get the "Best" vision through a strong minus lens. Some ODs will not over-prescribe like this, but will provide a lens that gives you 20/20. The difference can be 1/2 to 3/4 diopters.
otissumnerbrown 2 months ago
a little confused, how to use JCC, how do i know it's to refine the angle or to make sure is it dioptric power to high or too low??? would you please tell me, thank you...
13drey666 9 months ago
I love it when the doctor uses the phoroptor!! Best part of the exam :D
Thanks for the info by the way. Always wondered how they did all that flipping and switching.
TastyGenitals 1 year ago 2
Answered many questions I had. The phoropter is my favorite part of the eye exam.
14DaveHunter 1 year ago
I thought one was better than two.
Remington1875 1 year ago 17
I have noticed that if I tilt my glasses FORWARD my right eye long range vision improves, and the same for my left eye if I tilt them BACKWARDS. What has changed, nearsightedness or astigmatism?
gimondix 1 year ago
@gimondix It may be that your prescription has changed a little bit. These optical tricks are fairly predictive. I am always suspicious that the astigmatism, however big or small, may need to be adjusted when some one comes in with the same experience. If the glasses(Rx) is new have it re-checked. If not, then it is time for an exam. The change may be pretty subtle though.
justinsparhawk 1 year ago
This has been flagged as spam show
@justinsparhawk How long should i wear 1 month lenses? and please don't say one month cause that's fucking bullshit...eye doctors say that just to get more money.. i wear mine now 2 months without a problem keeping them clean, and i have no problem.Not going to wear them for 3 months , but is it ok to keep wearing them for 2? lenses are B&L.Tnx!
MAnGaThaBOy 4 months ago
@gimondix it depends. If you have farsightedness and the eyeglasses you are currently wearing has insufficient grade, moving your eyeglasses forward will improve your longrangevision in your right eye.. If ever you have nearsightedness and the eyeglasses you are currently wearing has too much power than you actually needed now, moving your eyeglasses forward will improve your longrange vision also
Holykissnz 1 year ago
bet this cost a few of the queens notes to buy,
andywhiteley1 1 year ago
I liked this video. I never knew there were micro adjustments being made so saying they looked the same was a good thing. I thought it was just all various lens you were going through and kept getting added.
igykalen 2 years ago
My first eye doctor when i was a little kid was a fast talking Indian who would say "this or this, this or this, this or this..." way to fast for me to focus on either one and I'd say 'this' as he was changing it and he would move on to the next thing.
That was somewhat disconcerting.
igykalen 2 years ago 7
It looks like it takes about 10 percent of the time to determine the spherical refractive state, and 90 percent for "astigmatism". Good presentation. Thanks!
otissumnerbrown 2 years ago
Shhh!!! You are letting out the secret :p
achir1048 2 years ago
This is very interesting, to see the machine from the other side! Do you ever find that people can't tell you which one looks clearer, or more interestingly, that the angle of astigmatism changes during the exam or from one exam to another?
HappyHag 2 years ago
@HappyHag yes I find both of those. If some one can't tell the difference between two views I tend to give less power, knowing that when both eyes come together vision will be better anyway. As far as the angle changing during the exam, that is more difficult. I will use as much information as I can including past prescriptions, perceived vision with the past Rx, auto refraction... Then I will use the trial frame with loose lenses instead of the phoropter.
justinsparhawk 2 years ago
That sounds like a very sensible approach!
HappyHag 2 years ago
Thanks, this is the first video I've been able to find that explains a phoropter (sp?).
Osmose1000 2 years ago
You are very welcome. Of course there are many other things it can do but 99% of the time we are looking at those three things. Thanks for the comment.
justinsparhawk 2 years ago