5
votes
Accepted
How to reduce the side effects of wearing contact lens?
Questions 1-2
Unfortunately, the answer to these depend on the exact brand and line of contacts used. For example, here is a long list of silicon hydrogel lenses, and how long they last. Here is ...
- 314
5
votes
Accepted
Why are there different perscriptions for glasses and contacts? Help me see eye to eye on this
Partly the additional sizing information required for contacts (Diameter and curvature of the cornea are needed for contact lenses but not for glasses) and the power also changes because the physical ...
- 1,291
3
votes
Accepted
How can the human eye be tricked into keeping the lens relaxed?
To form a clear image, light must be focused on the retina, which detects the light and sends signals through the optic nerve to the visual centre of the brain. To achieve the focusing, most ...
- 3,414
3
votes
Using farsighted glasses to counter nearsightedness?
Note
This answer is not a substitute for medical advice and medical advice questions are off-topic here. If you have concerns about your eyesight you must speak to your optometrist (or ...
- 6,236
3
votes
Accepted
How is the eye score interpreted?
The information you provided
Right lens Sph -0,50 Cyl -0,50 axis 10
Left Lens Sph -0,50 Cyl -0,50 axis 170
Type CR39 SN ARC
is a little bit clearer than you can sometimes see.
When you look ...
- 6,236
3
votes
Accepted
Based on the metrics of two glasses prescriptions, can I deduce values of an intermediary prescription
You should not try to self diagnose an eye prescription.
That being said, I'm going to partly disagree with the previous answer based on some technicalities. First, the process you describe is ...
- 314
2
votes
Based on the metrics of two glasses prescriptions, can I deduce values of an intermediary prescription
I have a magic number X. Take a guess what it could be?
Is it 15?
No, 15 is too high.
Is it 12?
No, 12 is too low.
This leaves you with the mathematical average of 13.5, but that doesn’t help you ...
- 6,930
2
votes
Accepted
How do blue light filtering lenses work? Is it possible that they could they negatively impact your vision?
There are many different ways (proprietary methods) that these blue light coating are manufactured, but one general principle is called anti-reflection coatings. *I say "one general method" because ...
- 411
2
votes
Contiuously wearing the same contact lens - ok?
Generally, wearing the same pair of contact lenses longer then 6-12 months can cause increased risk of infection, as your biggest concern. Sleeping with contact lenses in has a similar risk, as ...
- 121
2
votes
Why do optometrists recommend dilation when the power of a lens can be measured even by a ruler?
The value of dilation of the pupil far outweighs the inconvenience.In fact, I'd offer that if an exam is done without it, you potentially lose the following:
--full access to all the structure of the ...
2
votes
Accepted
Lensometer readout -- PSM
The abbreviations can be explained but the printout does look incomplete. There are some reasonable summaries on various optician websites.
SPH (Sphere) is the overall correction for short or long ...
- 794
1
vote
What ocular disorders fit within the scopes of practice of both ophthalmologists and optometrists?
Both ophthalmologists and optometrists play crucial roles in eye care, but their scopes of practice differ, particularly when it comes to the diagnosis and treatment of ocular disorders. However, ...
1
vote
"SPH" Written in Cylinder section of prescription, along with no axis?
I found the answer:
"CYL" in Spherical section, means no correction needed
"SPH" in Cylindrical section, means no correction needed
If AXIS is zero, that is shorthand way some O....
- 111
1
vote
Why do optometrists "measure" your prescription with lenses orthogonal to the floor?
Although the tops of your ears maybe below the centre(s) of your eye(s) - you can have one ear lower than the other too - everyone is different. Some may find their ears are above the eye centres.
...
- 6,236
1
vote
Contiuously wearing the same contact lens - ok?
In optometry, "Continuous Wear" of contact lenses is a term used to refer to FDA approval of a contact lenses for wear continuously up to 30 days, then removing them for at least a full night of rest. ...
- 141
1
vote
Accepted
Light Sensitivity as a result of Caffeine Intake
From "Значение ретино-эпифизарной системы для психофармакологического эффекта" by Karen Ovanesov, who is co-author of one of those Russian articles on Pubmed to which you refer:
(...) the ...
1
vote
What is a "contact lens fitting"?
A contact lenses fitting is more expensive than a standard vision examination for glasses. There are several reasons.
The doctor (Optometrist or Ophthalmologist) must measure more perimeters of the ...
- 141
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