Eye Test in Da Lat: What to Expect at an Optical Store

An eye test at an optical store is a refraction check: it measures how your eyes focus so that the correct lens power can be selected. It is not the same as a medical eye examination, which looks for disease and is carried out by an ophthalmologist. Both are useful, and they answer different questions.

What the check involves

The measurement is done in stages rather than all at once. In broad terms it covers your current correction if you already wear glasses, an objective machine reading as a starting point, then a subjective refinement where you compare lens options and say which is clearer. Distance between your pupils is measured so the optical centre of each lens sits in front of the right place.

Most people are finished within roughly 15–30 minutes. It can take longer if your prescription has changed a lot, if there is significant astigmatism, or if you are trying progressive lenses for the first time.

What the result means

Your prescription is written using a small set of abbreviations that are the same worldwide:

• SPH — the main lens power. A minus value indicates myopia (short sight), a plus value hyperopia (long sight).
• CYL and AXIS — the amount and orientation of astigmatism correction.
• ADD — additional near power, used for reading and progressive lenses.
• PD — the distance between your pupils.

When to have your eyes checked

General guidance is to have vision re-checked periodically, and sooner if something changes. Signs worth acting on include frequent headaches when reading or using a screen, having to squint at distance, print that seems to need more light than it used to, or double vision. Children may not report any of this, because their current vision is the only vision they know — which is why school-age checks matter.

If a check suggests something beyond a change in lens power, the appropriate step is an assessment by an eye doctor. A refraction test cannot diagnose or treat eye disease.

Cost

The eye test in store is free.

How long it takes and what it costs

A straightforward refraction takes around 15 to 20 minutes. Allow longer if you are being measured for progressive lenses, because fitting heights are taken with the chosen frame on your face.

The eye test in store is free. There is no separate examination fee to weigh up.

The equipment

The objective starting reading is taken on Nidek equipment; Essilor machines are used later, to edge the lenses. Machine readings are a starting point, not the answer: the number that ends up in your glasses comes from the subjective stage, where you compare options and say which is clearer. A good result depends on that conversation, which is why it is worth doing in a language you are comfortable in.

What to bring

• Your current glasses, if you wear any. Reading the existing lenses is the fastest way to understand what you have been used to.
• Any written prescription you already hold — a phone photograph is fine.
• Contact lens wearers: if possible, come without lenses in, or having removed them a few hours earlier, since soft lenses can temporarily reshape the cornea.

When you need a doctor instead

A refraction answers one question: what lens power gives you the clearest image. It does not screen for disease. See an ophthalmologist rather than an optical store if you have sudden vision loss, persistent pain, flashes or a shower of new floaters, double vision that is new, or a noticeable change in one eye only. Diabetes, glaucoma in the family, or being significantly short-sighted are all reasons for periodic medical eye examinations regardless of how well your glasses work.

These are not competing services. A refraction tells you which lenses to buy; a medical examination tells you whether your eyes are healthy.

Children

Children can be refracted, and we stock 7 children’s frames. Children’s prescriptions change faster than adults’, and a child who is squinting, sitting very close to a screen, or complaining of headaches after school is worth checking rather than waiting. Where a child’s result looks unusual, a medical assessment is the right next step, not a stronger lens.

How often

For most adults with a stable prescription, every one to two years is reasonable. Come sooner if you notice distance blur returning, eye strain at the end of a working day, or that you have started holding your phone further away than you used to.

Related pages

• Optical store in Da Lat — what the shop stocks, what it costs and how a visit works.
• Prescription glasses in Da Lat — lens index, coatings and how to read your prescription.
• Same-day glasses in Da Lat — which prescriptions can be finished quickly and which cannot.
• Ray-Ban in Da Lat — checking authenticity, current stock and prescription fitting.
• Sunglasses in Da Lat — UV protection, polarised lenses and prescription sunglasses.

Visit us

• Address: 31 Nguyễn Văn Cừ, Phường Xuân Hương, Da Lat, Lam Dong
• Opening hours: Open daily, 09:00 – 21:00
• Phone / Zalo / WhatsApp: +84 925 331 668 — message on WhatsApp
• Directions: Open in Google Maps — about a 5-minute motorbike ride or a 15-minute walk from the Da Lat Night Market.
• Language: Our team can assist English-speaking customers through the whole process, from the eye examination to frame selection and fitting.

Mắt Kính Đặng Phước Quân has served Da Lat since 1991.