How to read an eye prescription

Oct 26, 2023 Source: Cainiu Health

Dr. Wang Shuai

Introduction

In general, an eyeglass prescription includes various pieces of information such as spherical power, cylindrical power, axis of astigmatism, spherical equivalent, and pupillary distance, which can be used to assess the condition of both eyes. If you have any confusion regarding any part of the prescription or concerns about your vision, it is recommended to consult an ophthalmologist for professional advice.

Generally, an eyeglass prescription contains various pieces of information, such as spherical power, cylindrical power, astigmatism axis, equivalent spherical power, and pupillary distance. These indicators can be used to assess the condition of both eyes. The specific details are as follows:

1. Spherical Power

The spherical power is abbreviated as "S" on the prescription and indicates the eye's ability to focus light. A "+" sign represents hyperopia (farsightedness), while a "-" sign represents myopia (nearsightedness). The larger the number, the higher the refractive error.

2. Cylindrical Power

The cylindrical power, abbreviated as "C," measures the degree of corneal astigmatism and reflects the severity of astigmatism. Generally, the larger the value, the more significant the astigmatism.

3. Astigmatism Axis

The astigmatism axis is abbreviated as "A" on the prescription and typically indicates the location of astigmatism on the cornea.

4. Equivalent Spherical Power

The equivalent spherical power, abbreviated as "S.E.," is a parameter that combines spherical and cylindrical powers to represent the overall refractive state of the eye. It is commonly used in the manufacturing of corrective lenses.

5. Pupillary Distance

Pupillary distance (abbreviated as "PD") refers to the distance between the centers of the pupils of the two eyes and is primarily used to ensure proper positioning of lenses in eyeglasses.

If you have any confusion regarding your prescription or concerns about your vision, it is recommended to consult an ophthalmologist for professional advice.

Related Articles

View All

Can I wear OK lenses if I have a cold and runny nose?

If you have only mild nasal discharge after a cold, without symptoms such as fever, frequent sneezing, or red and swollen eyes, and can strictly follow the OK lens care routine—thoroughly washing hands before handling lenses, cleaning the lenses with dedicated solution, and avoiding eye rubbing—short-term wear is generally not associated with serious problems. In such cases, the eyes are minimally affected, and proper lens care can reduce the risk of infection and maintain the effectiveness of the lenses.

View Full Answer

What are the efficacy and effects of Mupirocin ointment?

As a commonly used topical antibacterial agent, mupirocin ointment has effects and benefits including antibacterial and anti-inflammatory action, treatment of skin infections, promotion of wound healing, inhibition of bacterial growth, and relief of infection symptoms. Before application, the affected area should be cleaned, and contact with mucous membranes such as eyes, nose, and mouth should be avoided. The ointment is contraindicated for individuals allergic to its components. If abnormal reactions such as increased redness or swelling occur during use, discontinue immediately and seek medical advice.

View Full Answer

What are the efficacy and effects of Desonide cream?

As a low-potency topical corticosteroid, the efficacy and effects of desonide cream mainly include anti-inflammatory and antipruritic actions, suppression of allergic reactions, relief of eczema symptoms, reduction of neurodermatitis, and improvement of seborrheic dermatitis. The medication should not be used over large areas for prolonged periods. Caution is required when applying to delicate skin areas such as the face and genital region. It is contraindicated in individuals with hypersensitivity to its components. Avoid contact with eyes and other mucous membranes during use.

View Full Answer

What are the efficacy and effects of Acyclovir cream?

As a topical antiviral medication, acyclovir cream exerts its therapeutic effects primarily through anti-herpesvirus activity, treating herpes zoster, relieving symptoms of simple herpes, inhibiting viral replication, and promoting healing of herpes lesions. This medication is intended for use on skin and mucous membranes only and should avoid contact with the eyes. It is contraindicated in individuals allergic to acyclovir. Pregnant and breastfeeding women should use it with caution. Keep the affected area clean and dry during treatment.

View Full Answer

What are the efficacy and effects of Clotrimazole Cream?

As a topical antifungal medication, clotrimazole cream's efficacy and functions mainly include treating fungal infections, managing dermatophytosis, relieving candidiasis, improving symptoms of pityriasis versicolor, and inhibiting fungal proliferation. This medication is for external use only and must not be taken orally; contact with eyes and mucous membranes should be avoided. It is contraindicated for individuals allergic to its components. During treatment, keep the affected area clean and dry. If symptoms do not improve, seek medical attention promptly.

View Full Answer

Is it dangerous if the eyes are red when having chickenpox?

In general, whether redness of the eyes during chickenpox is dangerous depends on specific symptoms and whether complications have developed. If any discomfort occurs, it is advisable to seek medical attention promptly. Maintain good eye hygiene by gently wiping away eye secretions with a clean cotton swab dipped in normal saline. Keep fingernails short and avoid rubbing the eyes to prevent worsening infection. Limit use of electronic devices and avoid exposure to bright light.

View Full Answer

Can ultraviolet light kill viruses?

In general, whether ultraviolet (UV) light can kill viruses depends on the specific type. Short-wavelength UV light has strong germicidal effects and can effectively inactivate viruses; medium- and long-wavelength UV light have weaker energy and usually cannot achieve a killing effect. When using UV light for disinfection in daily life, it is important to choose a certified short-wavelength UV device and avoid direct exposure to human skin and eyes during use.

View Full Answer

What to apply for dry, stinging, and red skin around the eyes

Products suitable for dry, stinging, and red skin around the eyes include medical-grade petroleum jelly, ceramide eye cream, vitamin E emulsion, recombinant human epidermal growth factor gel, and hydrocortisone cream. Medical-grade petroleum jelly is mild and non-irritating; it forms an occlusive protective barrier on the skin around the eyes, reducing moisture loss and alleviating dryness. It is ideal for periorbital discomfort caused solely by dryness.

View Full Answer

Your trusted source for health information and wellness guidance.

Quick Links

Resources

Connect

© 2024 HealthPortal. All rights reserved.