Complete Guides
Vision Health Guides,
One Topic Per Page
Written by Optometrist YoYo, based on real clinical fitting practice. Each guide brings together every article on its topic, from the underlying principles to choosing an option.
The Complete Guide to Progressive Lenses
How they work, a comparison of 4 presbyopia options, choosing a lens tier, troubleshooting dizziness, and how to adapt — every common progressive-lens question answered in one place.
Read the guide → Children's VisionThe Complete Guide to Children's Myopia Tracking
Why myopia keeps progressing, how optometry clinics and ophthalmologists divide the work, the mistakes parents make most often, and why regular tracking is the key.
Read the guide → High MyopiaThe Complete Guide to High-Myopia Eyewear
The optical differences of prescriptions above -6.00D, choosing a lens index, frame principles, and the trade-offs between glasses and contact lenses.
Read the guide → Lens BrandsThe Complete Guide to Choosing a Lens Brand
A positioning comparison of ZEISS, HOYA, NIKON, and Essilor, how to choose by your needs, and why the "tier" matters more than the "brand".
Read the guide → Digital Eye StrainThe Complete Guide to Screen-User Eye Strain
Why long screen time tires your eyes, a self-check of symptoms, viewing habits, and lens options — written for engineers, doctors, and office workers.
Read the guide → Local Buying GuideThe Complete Guide to Buying Glasses in New Taipei
How an optometry clinic differs from an eyewear shop, how to judge a good clinic, common eyewear pitfalls, and local choices in Xinzhuang and Banqiao.
Read the guide → Where to Go FirstEye Doctor or Optometrist? A Symptom Triage Guide
We are not an eye clinic — which symptoms need a physician right away (redness, pain, sudden vision loss, a surge of floaters), and which an optometry clinic can handle (prescription changes, uncomfortable glasses, fitting assessment), laid out honestly in a 30-second triage list.
Read the guide → Why the Exam MattersChoosing a Good Optometrist Beats Choosing a Good Lens
A pair of glasses is the product of lens x fitting: however good the lens, an incomplete exam won't let it perform. From the five links in the chain and a green-flag checklist to the signals worth noticing and how optometry is regulated in Taiwan.
Read the guide → Bring Your Own FrameThe Complete Guide to Bring-Your-Own-Frame Lenses
Frames bought online, designer frames, old frames and vintage frames are all welcome for lenses — condition assessment, an honest account of the risks, transparent pricing (lens price plus a fixed fitting fee), and the same measurement standard as a complete pair.
Read the guide → Frame SelectionThe Complete Guide to Choosing Frames
Matching frames to your face shape, comparing acetate, metal, and titanium, reading frame sizing for a proper fit, and matching frames to your lens needs.
Read the guide → Optical BasicsOptical Basics Encyclopedia
Prescription power, diopters, PD, vertex distance, refractive index, aspheric, coatings, blue light, polarized, photochromic — the jargon on your prescription and lenses, explained in plain language.
Read the guide → Binocular VisionThe Complete Guide to Aniseikonia
A big difference between your two prescriptions, dizziness after a while, text that seems to jump, weaker depth perception? From the optics of aniseikonia and a symptom self-check to how a fitting can reduce the difference in image size.
Read the guide → Rigid Contact LensesThe Complete Guide to RGP Rigid Contact Lenses
What RGP lenses are, how they differ from soft lenses and from orthokeratology (Ortho-K), who they may suit, and the fitting process and safety essentials — daily-wear RGP explained in one page.
Read the guide →
Optometrist YoYo Cheng
Licensed optometrist of the Republic of China (License No. 003309), lead of Beyond Visual Optometry × BiYang Optometry Clinic. Every guide here is written by YoYo based on real clinical fitting practice — about the fitting and vision problems genuinely encountered and handled in the exam room every day, not a rehash of information found online.
Meet Optometrist YoYo →