Cross Cyl Refraction Part 1: Subjective Refraction Part 7

[@brandonsolomon9535]

Wonderful videos by a great individual who lost his life in service to others. Dr. Squire has been an inspiration to many. I find great value in each of his many videos. They are of great personal value to me. He was not only a servant to those who could not acquire personal vision care, but he was a servant to Jesus Christ.

[@eddierodrigues8879]

Absolutely brilliant tutorial. I never will have to do a subjective because I sell refraction equipment, but this video was truly enlightening. The blur test is an excellent tip. Thank you Sir.

[@dominickogo2006]

Great teacher, I need in Ghana, West Africa.

[@esperanzasantiago832]

Good morning, thank you Sir Ian Squire, i had learn alot from your video!! Thank you very much!!

[@shellysalmah3519]

Hi Ian.... thanks for all your videos about refraction! It helped me a lot in practicing. I might miss some of your videos, anyways, I wonder if you have a tutorial video of how to prescribe a contact lens for patients? Thanks again :)

[@anshumang.216]

Thank you for this wonderful lecture on subjective refraction

[@bayaoukaci1230]

Waw brilliant clear step by step method, big thank you

[@mirafashion7505]

Hallo, thank you for your videos 🥰

[@arponlorance1638]

Thanks for your help video

[@camelCased]

Thank you for the videos, they were very helpful. Unfortunately the methods described here don't always work as expected for patients that have other serious vision conditions in addition to refractive errors. I had the bad luck to experience it on myself. Here's what happened. I have congenital ocular albinism, optic nerve hypoplasia and slight horizontal nystagmus. Because of these issues, my vision is very bad. I can see only the first two lines with my left eye and only the first line with my right eye. Things get especially blurry in distance. When reading books and using computer screen, I bring the item much closer (15 - 30cm, depending on text size) than healthy people do to be able to read the text, and even then I sometimes have to use magnifying glasses. I understand that these conditions cannot be helped much and I do not hope on wonders. Still, I hoped that it should be possible at least to reduce the blur. It turned to be correct - the doctor found out that I have also myopic astigmatism, so lenses up to -1D help me to see more clearly in distance without straining my eyes, and adding some cyl correction of -2D at 170 degree axis helps even more. I'm satisfied with my distance glasses. But with reading glasses it was a total failure. The doctor saw how I'm reading small newspaper letters with eyes strained, so he added +1.5D to my neutral (with 0 sphere equivalent) cyl prescription. Initially I was glad - hey, now I see the small text better! But when I tried to read computer screen or text books, it all was messed up because of my reading distance differences, depending on text size. When the text is large enough, I move my head further, and now those +1.5 diopters actually make my eyes feel worse. I guess, there is some strange accomodation going on in my eye where at some point my eye doesn't need those + diopters any more and actually feel worse, maybe because my myopia kicks in. Initially I didn't know much about optometry. I just was disappointed with my two failed attempts to get reading glasses. It was important for me because I work as a programmer. Then I read some good books about the subject and watched some videos and bought a trial frame and some lenses from China and started experimenting. I started with correction that does only astigmatism correction to collapse my Sturm's conoid without affecting my focus as such. With lenses of +1sph and -2cyl I get 0 sph equivalent and my eyes feel noticeable improvement (sharper text) in both distance and reading and I don't feel so wrong as with my failed reading glasses when I attempt to read on computer screen. Still, it's doesn't feel a definite solution because my eyes don't feel as easy as when reading without the trial lenses, so I added +0.25 to make it better (and possibly less overminused at some areas in my eyes from those cyl lenses). It's currently very tricky - on one hand, reading feels better and sharper, on the other hand I feel some eyestrain but I'm not sure if it's from my choice of lenses or because of the fact that the trial frame is heavy, the lenses have limited field of view with rings around them and also because they are not as clean as glasses, no matter how I attempt to clean them (slight mist accumulates when you combine more than one lens in the trial frame - it's never as clear as final spectacles). So yeah, it's very tricky. I'm just trying to avoid spending money on new spectacles that would make me feel worse. Maybe I'll have to give up and accept the fact that it's impossible to find correction for reading, despite the fact that astigmatism correction works in general. Somehow my eyes don't like it at closer distances, although they like it at large distances. I'm not sure what more can be done here and what kinds of experiments should I try, considering that two doctors failed to achieve even those best results that I achieved myself.

[@javeriajaved-ic1qj]

perfectly explain....thank u sir

[@indianmedicalvideos]

Awesome...thnx a lot..

[@OptometryAcademy]

Good explanation sir. #optometryacademy

[@kapilhrathaur007]

superb sir

[@otiebrown9999]

What is severe cylinder? 1 diopter?

[@gaynzz6841]

Hi Otie, -2 to -4 CYL is considered severe.

[@kapilhrathaur007]

sir plz also explain in new video madox rod and worth 4 dot test and glare test.

[@poncepilate100]

thanks a lot

[@mirzapureyecarecentre7032]

How many prices this vision box in Bangladesh

[@hanmanthbandichode9882]

Sir I want to learn refraction again I have forgotten in accident soo hw much vision to put lenses which power.

[@ishaanika7449]

Your like my doctor u teach me the eye

[@EppingForest304]

Interesting

[@mayurparmar5376]

no sound

[@mohdakbar7643]

I need four job i am a lens fitting Tecnicen

[@eyecareprogrammss7122]

you give me certificate.

[@lois3137]

I'm astigmatic

[@tofikpathan5892]

Hidime upload karo pliz

[@tofikpathan5892]

Hindi me video upload karo pliz

[@tofikpathan5892]

Hidime upload karo pliz