A complete process of eye examinations

General Article

When we mention eyeglasses, most people associate “optometry” with them; optometry is an essential part of selecting prescription eyeglasses. But what are the steps of optometry, and whether there are corresponding standards have become a question in many people’s minds?
The optometry process has a corresponding standard. To “optometry technical service specification,” for example, provides in detail all the links in the optometry process, including: “basic examination,” “objective optometry,” and “subjective optometry.”

Of course, if you already have a specific standard prescription, then why not start by matching your prescription glasses with free glasses online?

01 Basic examination
Inquiring about the history of lens wear.
Naked eye distance and near visual acuity examination or corrected visual acuity examination of the original glasses.
Examination of refractive parameters and photocentric distance of the original spectacle wearer.
Determination of pupillary distance or unilateral pupillary distance and pupil height for the distant use of both eyes.
Determination of dominant eye.
The purpose of this series of examinations is to better understand the client’s actual situation for further examination.

02 Objective Optometry
Objective optometry mainly uses objective optometry (computerized optometry) or normophthalmometry. The process does not require communication with the customer to check the actual refractive error state and serves as a reference basis for the subsequent examination.

03 Subjective optometry
Subjective optometry is to place the customer’s parameters into the comprehensive optometry and trial frame, adjust according to the feedback on the visual standard, and finally obtains the prescription data. In this process, the distance fog vision relaxation adjustment is performed to avoid impacting the test results.
Then viewing the visual acuity chart is to reach the primary visual acuity after the astigmatism test is performed to detect astigmatism.
Then a red and green vision scale test is performed to ensure that the prescription is not overcorrected, and then a crossed-column lens is performed to fine-tune the axis and focal length of astigmatism.
A visual balance test follows a binocular test.
Then a second red and green visual scale test was to determine the initial refractive prescription.
Finally, a trial adjustment is made to arrive at a final prescription for distance use.

If the customer has presbyopia, presbyopic optometry is also required. This is done by determining the near working distance and measuring the pupillary distance for near use.
Then test the adjustment range and the near addition, and fine-tune the near addition luminosity.

Finally, a near-use prescription is issued for reading and trial wear.

In addition to the standard process of optometry, there are also standards for the results of optometry.

Because the human eye is an ecosystem, the results of optometry can vary at different times of the day and night and with various physical conditions. In addition, the requirements for vision may vary depending on the environment of use and work life. Therefore, the results of optometry are not unique and may vary from time to time and from place to place. However, optometry prescriptions have basic principles: the optometrist will follow the lowest degree of best vision for myopia and the highest degree of best vision for hyperopia. In addition, if there is astigmatism, the prescription should be clear, comfortable, and sustainable, considering the customer’s actual use and wearing habits.

Optometry is the basis of “prescription.” You must pass a scientific and rigorous examination to get a pair of accurate and comfortable glasses. It is necessary to go through a scientific and rigorous optometry process so that consumers can see more clearly and comfortably without causing secondary damage. Especially for teenage students, if they wear unsuitable or poor-quality glasses, the eye damage is immeasurable (most often, the prescription deepens quickly). Therefore, if parents find their children’s vision is not good, they should promptly take them to regular eye health service institutions for examination and treatment.