Hi all. This is my first post after one year of following EM and also reading a ton and watching as much as I can of Jake’s videos. Despite all the warnings against asking about diopter reductions, per the Back to 20/20 “Strain Minimizer” post: “If you’re at all unsure after a bit of exploring, just start a new thread in the forum. Let me know your centimeter averages, your Snellen results and your current diopters. Include all the data so I can help you make a good assessment.” I am asking for help and advice. So please don’t yell at me since I am hoping this is the correct forum to ask this question. My answers to those questions are below:
1) Three days of centimeter averages for the left and right eye.
8.3 / 9.1
7.4 / 8.4
7.3 / 7.6
So my calculated diopters in general look like they should be around 13 OD and 12 OS.
2) Your Snellen results with your regular glasses. Glasses = 20/25 and 20/30; contacts = 20/20 both eyes.
3) Your current diopters (of your regular glasses). Glasses (sph/cyk/axis) = OD -19.25 / -0.25 / 175; OS -18 / -1 / 154. Contacts = (pwr / base curve / diameter) = OD -18.5 / 7.3 / 14.5; IS -18 / 7.3 / 14.5 (both also say “SC 8.6” and I can’t find what that means)
4) Your average comfortable ergonomic distance from your screen. With my contacts I can go as far as 110cm. With +2.5 readers with my contacts, I am comfortable at 50cm.
My summary, hoping for your feedback and advice: Based on the average of my measurements of distance to blur, my calculated average of diopters for both eyes should be around 13 and 12. Therefore, it would seem that my current “subscription” (-19.25 and -18) is WILDLY OFF and looks way overprescribed! So it would make you think that I could WAY down even for distance vision to maybe at least -15 or so for distance. But then with +2.5 readers while wearing my contacts, while I am comfortable at 50cm for reading at arm’s length, my distance feels really compromised (i.e., would not feel comfortable super comfortable driving). So that leave me a little puzzled, since the distance to blur calculations would put me at a much lower (negative, speaking in absolute terms) reading than just -16.75 and -15.5 (my prescription accounting for the +2.5 readers, which should be my calculated differentials) but the distance vision with those readers, and even +1.5 readers!) seems quite intolerable for anything except near work.
So would your recommendation be to just get new glasses made for -16.75 and -15.5 for near/ computer work, and leave my normalized (even if my normalized seems overprescribed)?
Two other pieces of potentially relevant information: a) I do have astigmatism (which began last year) so my distance to seeing clearly is just around 6mm, so per Jake’s astigmatism post, my “range” of seeing clearly without lenses is basically just 1-2mm. b) I get my glasses made in Hong Kong because they allow higher refraction there and my prescription, if made with US lenses, is impossibly bulky and the thickness of the actual lenses actually distorts my vision. They aren’t cheap to make, which means I’m trying to be somewhat economical about getting numerous pairs made, but again, it’s for my eye health and willing to do what it takes. The other option would be just to use my contact lenses and get readers for near work, which is cheaper, but I’m simultaneously also trying to have less plastic in my eye for the entire day if possible (even if they are rigid gas permeable lenses with a soft skirt, since especially the soft lens part decreases oxygen significantly to my eyeball). c) I have found a GREAT optometrist in San Francisco who is willing to basically allow me to dictate what prescriptions I want for my contacts and glasses. My vision plan covers me for 1 set of contacts for the year. I am due for new contacts now, and can’t get them covered under insurance again until another year. Given this, would you suggest I ask him for a decreased contact lens prescription of maybe about -1 diopter since it seems like I’m overprescribed and try decreasing my normalized prescription first, and then going to order the glasses (which I pay out of pocket for), and in the meantime, use readers for near-work? I know the idea is not to try to reduce both at the same time, so maybe not use readers for near work for 6-8 weeks, and then after my eyes are adjusted to the decreased normalized prescription for distance to try to get the differentials at that point?
Thank you in advance for reading this ultra-long post and any advice you can provide.