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Refraction
Refraction is the determination of a glasses prescription. Usually a phoropter is used, which the patient looks through at an illuminated screen. The examiner tries different lenses to determine the combination that gives the sharpest vision for each eye. Refraction can also be done using an autorefractor, but this is typically used as a starting point to be refined with the manual refraction.
Dr. David Chandler reviewed this
31 year experience in Ophthalmology
How long it usually lasts:
Related questions
A 48-year old asked:
What is the repeatability of subjective refraction?
1 doctor answer • 2 doctors weighed in
A 71-year old male asked:
Can a pvd cause refraction?
1 doctor answer • 2 doctors weighed in
A 37-year old female asked:
What is cycloplegic refraction?
1 doctor answer • 2 doctors weighed in
A 38-year old asked:
At what age is cycloplegic refraction necessary ?
1 doctor answer • 2 doctors weighed in
A 49-year old asked:
Can you tell me more about cycloplegic refraction (cyclo exam)?
1 doctor answer • 1 doctor weighed in
A 28-year old male asked:
What is the definition or description of: refraction?
1 doctor answer • 1 doctor weighed in
A 32-year old asked:
Do you know the highest myopic refraction on record?
1 doctor answer • 2 doctors weighed in
A 40-year old asked:
How is the refraction test used to diagnose presbyopia?
1 doctor answer • 5 doctors weighed in
A 22-year old female asked:
What is the meaning of having refraction of 0.25 after lasik ?
2 doctor answers • 5 doctors weighed in
A 48-year old asked:
What are the different types of eye refraction corrections?
1 doctor answer • 2 doctors weighed in
A 36-year old asked:
How does wet refraction work?
1 doctor answer • 2 doctors weighed in
A 44-year old asked:
Why don't physiology books show refraction at the anterior surface of the cornea?
1 doctor answer • 2 doctors weighed in
A 21-year old male asked:
How accurate is auto refractometer in telling refraction error or prescription...100% or not ?
1 doctor answer • 5 doctors weighed in
A 45-year old asked:
What is "eye refraction level" meaning?
2 doctor answers • 5 doctors weighed in
A 42-year old male asked:
After 1 month after rd surgery my daughter refraction is as " sph -0.50 cyl -1.25 axis 175 va 6/7.5 . Is this good readings? Will it improve later?
1 doctor answer • 1 doctor weighed in
A 36-year old asked:
Will wearing glasses without grade or refraction index damage the eyes?
1 doctor answer • 1 doctor weighed in
A 31-year old asked:
What are your thoughts? Could wearing glasses without grade or refraction index, damage the eyes?
1 doctor answer • 1 doctor weighed in
A 31-year old asked:
Can the multifocal be made from my previous eye refraction test?
1 doctor answer • 2 doctors weighed in
A 38-year old asked:
What does the refractive error & corneal refraction in eyes mean?
1 doctor answer • 2 doctors weighed in
A 44-year old asked:
My left eye has been doing this weird light refraction for the past twenty minutes. What is causing it?
1 doctor answer • 3 doctors weighed in
A 33-year old asked:
How would blood sugar level affect eye refraction index ?
1 doctor answer • 3 doctors weighed in
A 37-year old asked:
What is the effect of blood sugar level on eye refraction index?
2 doctor answers • 2 doctors weighed in
A 45-year old asked:
Please help! what is the effect of blood sugar level on eye refraction index?
1 doctor answer • 2 doctors weighed in
A 35-year old asked:
What do you call the structure in the eye that causes the largest amount of refraction?
4 doctor answers • 6 doctors weighed in
A 45-year old asked:
I had refraction of my eyes for my eyeglass. Now I have my eyeglass, my right eye feels uncomfortable. Any tips?
1 doctor answer • 2 doctors weighed in
A 37-year old female asked:
Visual acuity OD 20/20 OS 20/63. OS amblyopia.After cyclo refraction my son needs OD +2.75 OS +4.00.Does this mean that his eyes are working overtime?
1 doctor answer • 2 doctors weighed in
A 41-year old asked:
How will an eye doctor perform eye examination without refraction?
1 doctor answer • 3 doctors weighed in
A 42-year old male asked:
Os: 0.5x-0.5, od: 0x-0.25 after lasik. Right eye always strained after reading. Is this presbyopia, or result of different refraction? Disappointed!
3 doctor answers • 6 doctors weighed in
A 20-year old male asked:
My teacher told me that all myopia is genetic. Is it? Does playing computer or reading in short distance affect the refraction of light to our eyes?tq
1 doctor answer • 3 doctors weighed in
A 67-year old female asked:
Is it typical to have a refraction done before laser surgery following cataract surgery. I had a routine eye exam with refraction 3 months ago.
2 doctor answers • 2 doctors weighed in
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