Color Blindness: Types, Causes, and Daily Life Tips
Color blindness affects 1 in 12 men. Learn about the different types, what causes it, how it is tested, and practical strategies for living with color vision deficiency.



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From routine eye exams to advanced treatments, our clinic is dedicated to protecting and enhancing your vision at every stage of life.
Browse optometrists, LASIK clinics, and eye care providers across major US cities.
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We combine expert specialists with advanced technology to deliver accurate and reliable eye care. Our focus is on patient comfort, safety, and long-term vision health.
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Skilled doctors with proven expertise in treatments.
Care solutions under one roof, from checkups to surgery.
A vision center is a full-service eye care facility offering comprehensive eye exams, prescription eyewear (glasses and contacts), and often specialty services like LASIK consultations. Major retailers like Walmart, Costco, and Target operate in-store vision centers alongside independent and optical chain locations.
A basic eye exam without insurance typically costs $50β$250 depending on location and provider type. A comprehensive dilated exam can run $100β$300. Many vision centers offer walk-in pricing and accept a wide range of vision insurance plans.
Medicaid coverage for eye care varies by state. Most state Medicaid plans cover annual eye exams for children; adult coverage is more limited. Some states cover one pair of glasses or contacts per year. Use our directory to filter for providers that accept Medicaid near you.
Adults with no existing vision problems should have a comprehensive eye exam every 1β2 years. Children should have their first exam at 6 months, again at age 3, and before starting school. Adults 60+ and those with diabetes or a family history of glaucoma should be seen annually.
LASIK (Laser-Assisted In Situ Keratomileusis) is a refractive surgery that reshapes the cornea to correct nearsightedness, farsightedness, and astigmatism. Good candidates are 18+ with a stable prescription, adequate corneal thickness, and no dry eye conditions. Use our LASIK Cost Calculator to estimate your cost.
20/20 means you can see clearly at 20 feet what a person with normal vision sees at 20 feet. It represents the standard for normal visual acuity. 20/40 means you need to be 20 feet away to see what a normal-sighted person sees from 40 feet β the minimum required in most states for driving without corrective lenses.
An optometrist (OD) is a licensed primary eye care provider who examines eyes, prescribes glasses and contacts, and diagnoses/treats common eye conditions. An ophthalmologist (MD or DO) is a medical doctor who can perform surgery (including LASIK and cataract surgery) in addition to all optometric services.
Your prescription includes OD (right eye) and OS (left eye) values. SPH (sphere) is the main correction power β negative means nearsighted, positive means farsighted. CYL (cylinder) and AXIS correct astigmatism. ADD is a reading addition for bifocals. Use our free Prescription Decoder tool to translate your numbers.