What is SPH on contact lenses?
The abbreviation SPH stands for Sphere. It describes the amount of lens measured in diopters that you need for good vision. The term means that the correction for your sight is spherical. If you are shortsighted, the number under the abbreviation will include a (-) sign.
What is SPH and CYL in eye?
Here is a simple guide to it means: Sph (sphere) represents how long or short sighted you are. This can be positive (+) for long sight or negative (-) for short sight. The higher the number, the stronger your lens. Cyl (cylinder) represents the amount of astigmatism present.
What is SPH & PD?
Binocular PD is the distance from one of your pupils to the other pupil. Prism is used if you have double vision. It indicates the amount of prismatic power your glasses need to correct for differences in the alignment of your eyes. SPH means sphere, or the power of the lens that will correct your eyesight.
What does SPH of mean?
Sphere (SPH) The sphere column is often abbreviated as SPH. This is the lens power needed to fix your vision. A minus sign (₋) next to the number means nearsightedness (you see better up close and need distance correction) and a plus sign (₊) is farsightedness (you see better far away and need near correction).
What does CYL mean in contacts?
Cylinder (CYL): The amount of lens power for astigmatism. The number in this column may be preceded with a minus sign or a plus sign (for farsighted astigmatism). Axis: This is the lens meridian with no cylinder power, meant to fix astigmatism, represented by a number between 1 and 180.
What is OD for contact lenses?
O.D.- This is oculus dexter, meaning right eye. O.S.- This is oculus sinister, meaning left eye. O.U.- This is oculus uterque, meaning both eyes.
What is a good eye axis?
If you have “normal” eyesight, there would not be an axis number, as you would not have astigmatism. However, the most “normal” eyes with this condition would tend to have approximately 0.50 dioptres of negative cylinder power with a 180 axis number.
What SPH is legally blind?
Someone who cannot view the line for 20/100 but sees somewhere between 20/100 and 20/200 would still meet the government’s standard of legal blindness, which is why it is listed as “20/200 or less.”
How do you read a contact lens prescription?
How to Read Your Contact Lens Prescription
- OD: Oculus dexter, the Latin term for right eye.
- OS: Oculus sinister, the Latin term for left eye.
- PWR: Power (also referred to as Sphere or SPH)
- BC: Base Curve (usually a number between 8 and 10)
- DIA: Diameter (usually a number between 13 and 15)
Is SPH the same as power?
SPH: Sphere – this is the measurement stating how nearsighted or farsighted you are. It measures in diopters, which measures the curve of the lens. Power: Same as sphere. Some prescriptions use power instead of SPH.
Does Cyl matter for contacts?
The cylinder value is required for the production of contact lenses for astigmatism. It is a negative value that corrects the corneal curvature.
What is OD and OS in contact lenses?
They are Latin abbreviations: OS (oculus sinister) means the left eye and OD (oculus dextrus) means the right eye. Occasionally, you will see a notation for OU, which means something involving both eyes.
What is legally blind in contacts?
If you wear contact lenses or eyeglasses, your eyesight will also be measured while wearing these corrective lenses. To be considered legally blind, your vision will need to be 20/200 or worse while wearing your lenses, or you must meet the visual field criteria.
Is a PD of 75 normal?
Average pupillary distance for an adult is between 54-68mm, with acceptable measurement deviations generally falling in between 48mm and 73mm. The range for children is approximately 41-55mm.
What is normal IPD?
The distance between your eyes is called interpupillary distance (IPD). This space varies from person to person ranging from 42 to 75mm with a mean average of 61mm for women and 63mm for men. Failure to properly measure and set IPD may result in blur, eyestrain, distortion and it might even make some people feel sick.
What is cyl in contact lenses?
Cylinder (CYL): The cylinder will always be a minus number that increases in measures of 0.25. Much like the power/sphere figure that is shown on all standard prescriptions, the cylinder for toric lenses denotes the extra visual requirements needed for astigmatism and how severe the astigmatism is.
What is DIA for contacts?
Abbreviated “DIA” the diameter of a lens measures the width of a lens in millimeters, from end to end. The average size of a contact lens is between 13.5 and 15 millimeters.
What is a good axis for eyes?