Understanding Your Prescription
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To overcome the confusion of spectacle correction and clarify the power below listed the guidelines to follow and know while seeing through a prescription given by an ophthalmologist or optometrist:
- A patient coming with a prescription Right eye (-1.75/-2.00*90) defines -1.75 as spherical power,-2.00 as cylindrical power, and 90 as the axis. It’s a mixed power that consists of minus spherical power, cylindrical power, and axis.
- Spherical power or sphere component –Every corrective lens prescription includes a spherical correction in diopters. Convergent powers are positive (e.g., +4.00 D) and condense light to correct for farsightedness/long-sightedness (hyperopia) or allow the patient to read more comfortably (see presbyopia and binocular vision disorders). Divergent powers are negative (e.g., −3.75 D) and spread out light to correct for near-sightedness/short-sightedness (myopia). If neither convergence nor divergence is required in the prescription, “Plano” is used to denote a refractive power of zero.
- Cylindrical power/cylindrical component-Patients with astigmatism need a cylindrical lens or a toric lens to see clearly. The geometry of a toric lens focuses light differently in different meridians. A meridian, in this case, is a plane that is perpendicular to the optical axis. For example, when rotated correctly, a toric lens could focus an object to the image of a horizontal line at one focal distance while focusing a vertical line to a separate focal distance.
- Axis-The axis defines the location of the sphere and cylinder powers
- Patients above the age of 40 (presbyopia) immerse with the complaint of diminished near vision, as a result, they got one additional power i.e the add or the near power -1.75/-2.00*90 Add +1.00. In case of Additional power, the patient may go for either Bifocal glass or Progressive glass
- Bifocal glasses: Bifocal eyeglass lenses contain two lens powers to help you see objects at all distances after you lose the ability to naturally change the focus of your eyes due to age, also known as presbyopia. Due to this specific function, bifocal lenses are most commonly prescribed to people over the age of 40 to help compensate for the natural degradation of vision due to the aging process. A small portion in the lower part of the lens contains the power required to correct your near vision. The rest of the lens usually is for your distance vision. The lens segment devoted to near-vision correction can be one of several shapes:
- A half-moon — also called a flat-top, straight-top, or D segment
- A round segment
- A narrow rectangular area, known as a ribbon segment
- The full bottom half of a bifocal lens called the Franklin, Executive, or E style
- Progressive glasses: PALs are a type of multifocal lens specifically for people who need corrective lenses to see distant and close-up objects. To put it plainly, these lenses allow you to see clearly at multiple distances without a bifocal line. PALs provide a simpler, more convenient solution to age-related vision problems:
- The upper section of a progressive lens provides the strength you need to see clearly in the distance.
- The lower section provides the strength you need to see clearly up close.
- The middle section helps you see clearly at intermediate or middle distances.
Benefits of Progressive lenses:
- Only need one pair of glass
- No unsightly bifocal line
- Modern, youthful appearance
To overcome the trouble of prescription given you need to wear a pair of glasses comprising of Several lens materials which are suitable for different refractive errors and levels of prescription. They include:
- Plastic lenses: Also known as CR-39, these are often the most cost-effective lenses. They are suitable for lower-level prescriptions, but they do not impact resistant.
- Trivex lenses: These durable, lightweight, and thin lenses are also suitable for lower-level prescriptions. They are impact-resistant, which may benefit people at risk of eye trauma, such as athletes.
- Polycarbonate lenses: These are similar to Trivex lenses. They are highly durable are lightweight. They offer UV protection and are also impact resistant. They are suitable for low-to-medium level prescriptions.
- High index lenses: These are particularly suitable for higher-level or strong prescriptions. Their material is thin and light.
- Glass lenses: These are still available, but eye doctors tend to avoid them due to their weight, thickness, and risk of breakage.
- BLU CUT LENS: Blu cut lens is a coating that reflects harmful blue and restrict it through the lenses of eye glasses. Blue light is emitted from computer and mobile screens and long term exposures to this type of light increases the chances of retinal damage.
- CR-39: It is a plastic polymer used for manufacturing eyeglasses.
- PHOTOCHROMIC GLASSES: Photochromic lenses automatically get darker in the presence of sunlight. The big advantage of photochromic lenses is their versatility. People who wear them have essentially a pair of eyeglasses and sunglasses rolled into a single set of frames.
Abbreviations and terms
- DV is an abbreviation for distance vision. This specifies the part of the prescription designed primarily to improve far vision. In a bifocal lens, this generally indicates what is to be placed in the top segment.
- NV is an abbreviation for near vision. This may represent a single-vision lens prescription to improve near work or the reading portion of a bifocal lens.
- OD is an abbreviation for oculus dexter, Latin for the right eye from the patient’s point of view. Oculus means eye.
- OS is an abbreviation for oculus sinister, Latin for the left eye from the patient’s point of view.
- OU is an abbreviation for oculi uterque, Latin for both eyes.
- SPH, CYL, and AXIS are valued for describing the power of the lens using plus cylinder or minus cylinder notation.
- ADD is an abbreviation for Near Addition. This is the additional refractive power to be combined, or added, to the distance power to achieve the ideal near power.