Refractive Errors
Refractive errors are among the most common causes of blurred vision and can affect your ability to see clearly at near, far, or all distances. At Cali Eye Institute, we provide comprehensive eye examinations to accurately diagnose refractive errors and recommend the right solution for clearer vision.
Serving patients throughout Torrance, Lancaster, Ventura, and surrounding Southern California communities.
What Are Refractive Errors?
Refractive errors are among the most common eye conditions and the leading cause of blurry vision. They occur when the shape of the eye prevents light from focusing correctly on the retina, the light-sensitive tissue at the back of the eye that sends visual information to the brain. When light is not focused properly, objects may appear blurry at near distances, far distances, or both.
In a healthy eye, the cornea and natural lens work together to bend (refract) light so it lands precisely on the retina, producing clear vision. However, if the eye is too long, too short, or the cornea has an irregular shape, light focuses in the wrong place. This results in a refractive error and causes vision to become blurred.
There are three main types of refractive errors:
- Myopia (Nearsightedness) – Nearby objects appear clear, while distant objects look blurry.
- Hyperopia (Farsightedness) – Distant vision may be clearer than near vision, although both can be affected depending on the severity.
- Astigmatism – An irregularly shaped cornea or lens causes blurred or distorted vision at all distances.
Refractive errors can develop in both children and adults and often change gradually over time. They are commonly detected during routine comprehensive eye examinations, even before noticeable symptoms appear.
The good news is that refractive errors are highly treatable. Depending on your vision needs and eye health, they can usually be corrected with prescription eyeglasses, contact lenses, or laser vision correction procedures such as LASIK. A comprehensive eye examination is the best way to determine the type of refractive error you have and the most appropriate treatment to restore clear, comfortable vision.
Warning Signs of Refractive Errors
The symptoms of refractive errors vary depending on the type and severity of the condition. Some people notice blurry vision only when reading or driving, while others experience constant visual discomfort throughout the day. Because these symptoms often develop gradually, many people do not realize their vision can be corrected with the right treatment.
Blurred Vision
Objects may appear blurry at near distances, far distances, or both.
Frequent Squinting
Squinting may temporarily improve focus but often indicates an underlying vision problem.
Eye Strain
Your eyes may feel tired or uncomfortable after reading or extended screen use.
Frequent Headaches
Eye focusing problems can contribute to recurring headaches, especially after visual tasks.
Difficulty Reading
Small print may become difficult to focus on for extended periods of time.
Trouble Seeing Far Away
Road signs, classroom boards, or distant objects may appear blurry or unclear.
Night Vision Problems
Seeing clearly in low-light conditions may become more difficult, especially while driving.
Difficulty Changing Focus
Your eyes may struggle to quickly adjust between near and distant objects.
If vision changes are interfering with work, driving, reading, or everyday activities, the eye care specialists at Cali Eye Institute, Lancaster Eye Institute, and Anacapa Vision can perform a comprehensive evaluation to determine the cause and recommend personalized treatment options.
Causes of Refractive Errors
Most refractive errors are related to the natural structure of the eye and often develop gradually over time. They may be present from childhood or become more noticeable as the eyes grow and change. Genetics also plays an important role, making refractive errors more common in people with a family history of vision problems.
Common causes of refractive errors include:
- Eye Is Too Long – An elongated eyeball causes light to focus in front of the retina, leading to nearsightedness.
- Eye Is Too Short – A shorter eyeball causes light to focus behind the retina, resulting in farsightedness.
- Irregularly Shaped Cornea – An uneven corneal surface causes light to scatter, producing astigmatism.
- Irregularly Shaped Lens – Changes in the natural lens can also affect how light is focused.
- Genetic Factors – Refractive errors often run in families and may be inherited.
- Normal Eye Development – Vision can change naturally as the eyes grow during childhood and adolescence.
Refractive errors are not caused by eye strain or reading in dim light. They are structural conditions of the eye that can usually be corrected with glasses, contact lenses, or vision correction procedures such as LASIK.
Types of Refractive Errors
Myopia (Nearsightedness)
Myopia occurs when the eye grows too long or the cornea is too curved. As a result, light focuses in front of the retina rather than directly on it.
Common Symptoms of Myopia
- Blurry distance vision
- Difficulty reading road signs
- Squinting to see far-away objects
- Eye strain
- Headaches
People with myopia typically see nearby objects clearly while distant objects appear blurry.
Hyperopia (Farsightedness)
Hyperopia occurs when the eye is too short or the cornea is too flat. This causes light to focus behind the retina rather than directly on it.
Common Symptoms of Hyperopia
- Difficulty reading
- Eye fatigue
- Headaches after close work
- Blurred near vision
- Difficulty focusing on nearby objects
Some individuals with mild hyperopia may not notice symptoms until later in life.
Astigmatism
Astigmatism develops when the cornea or lens has an irregular shape. Instead of being round like a basketball, the cornea may resemble a football shape, causing light to focus at multiple points within the eye.
Common Symptoms of Astigmatism
- Blurred vision at all distances
- Distorted vision
- Difficulty seeing clearly at night
- Glare and halos around lights
- Eye strain
- Frequent headaches
Astigmatism commonly occurs alongside myopia or hyperopia.
Refractive Errors by the Numbers
Refractive errors affect hundreds of millions of people worldwide and remain one of the leading causes of correctable vision impairment. Many individuals rely on glasses or contact lenses to achieve clear vision, while others seek long-term surgical vision correction options.
Advances in modern vision correction technology have helped millions of patients reduce or eliminate their dependence on corrective eyewear.
If blurry vision is affecting your daily life, schedule a comprehensive eye examination at Cali Eye Institute in Torrance, Lancaster Eye Institute in Lancaster, or Anacapa Vision in Ventura.
Diagnosis of Refractive Errors
Refractive errors are diagnosed during a comprehensive eye examination designed to measure your vision and evaluate how light is focused inside the eye. These tests help determine the type and severity of the refractive error, allowing your ophthalmologist to recommend the most appropriate treatment for clear, comfortable vision.
Visual Acuity Testing
Measures how clearly you can see letters and objects at both near and far distances.
Refraction Testing
Determines your exact eyeglass or contact lens prescription for the clearest possible vision.
Corneal Evaluation
Examines the shape and health of the cornea to identify vision-related irregularities.
Wavefront Analysis
Maps subtle optical imperfections that can affect vision quality and treatment planning.
Potential Complications of Refractive Errors
Although refractive errors are not considered eye diseases, leaving them uncorrected can significantly affect your vision, comfort, and daily activities. Blurry vision forces the eyes to work harder to focus, which may lead to ongoing visual fatigue and make routine tasks more difficult. Fortunately, most of these complications can be prevented with proper diagnosis and vision correction.
Potential complications of uncorrected refractive errors include:
- Chronic Eye Strain – Constant focusing effort can leave your eyes feeling tired and uncomfortable.
- Frequent Headaches – Blurred vision and prolonged eye strain may contribute to recurring headaches.
- Difficulty Driving Safely – Poor distance vision can make reading signs and spotting hazards more difficult.
- Reduced Work or School Performance – Blurry vision may affect reading, learning, and overall productivity.
- Visual Fatigue – Extended reading or screen use may become increasingly uncomfortable over time.
- Difficulty with Sports and Activities – Poor vision can affect coordination, depth perception, and athletic performance.
- Reduced Quality of Life – Everyday tasks may become more frustrating due to persistent blurry vision.
- Vision Development Problems in Children – Uncorrected refractive errors may interfere with normal visual development and learning.
Regular comprehensive eye examinations can detect refractive errors early and help ensure you receive the most appropriate vision correction for clear, comfortable sight.
Treatment Options for Refractive Errors
Several treatment options are available depending on the type and severity of the refractive error, as well as the patient’s lifestyle and visual goals.
Eyeglasses
Prescription eyeglasses remain one of the most common and effective methods of correcting refractive errors.
Contact Lenses
Contact lenses provide an alternative to glasses and can correct myopia, hyperopia, and astigmatism.
LASIK
LASIK is a popular laser vision correction procedure that reshapes the cornea to improve how light focuses on the retina. LASIK may be an effective option for many patients with myopia, hyperopia, or astigmatism.
PRK
PRK is another laser vision correction procedure that may be recommended for patients who are not ideal candidates for LASIK.
Whether you rely on glasses, contact lenses, or are considering LASIK, the experienced ophthalmologists at Cali Eye Institute, Lancaster Eye Institute, and Anacapa Vision can help you determine the most appropriate path to clearer vision.
Why People Trust Cali Eye Institute
Cutting-Edge Technology & Surgical Innovation
At Cali Eye Institute, we utilize advanced diagnostic equipment and modern surgical techniques to ensure precise evaluations and exceptional visual outcomes. From comprehensive eye exams to advanced surgical procedures, our technology allows us to deliver safe, accurate, and effective treatment tailored to each patient.
Experienced, Board-Certified Ophthalmologist
Led by Babak Shabatian, our practice is built on years of clinical expertise in cataract surgery, laser vision correction, glaucoma management, and the treatment of complex eye conditions. Our commitment to excellence ensures that patients receive experienced, high-quality care at every stage of treatment.
Patient-Focused, Individualized Care
We believe every patient deserves a personalized approach. At Cali Eye Institute, treatment plans are carefully customized based on your unique vision needs, lifestyle, and long-term goals. Our team prioritizes clear communication, comfort, and confidence throughout your entire care journey.
Convenient Southern California Locations
With multiple locations serving communities across Southern California, including Torrance, Lancaster, and Ventura, we provide accessible, comprehensive eye care close to home. Our offices are designed for patient comfort with convenient access and parking.
Insurance Assistance & Flexible Scheduling
We accept a wide range of insurance plans, including Medicare, and offer flexible appointment scheduling to accommodate your personal and professional commitments. Our knowledgeable staff is available to assist with insurance verification and answer any financial questions.
A Commitment to Clinical Excellence
At Cali Eye Institute, our mission is to combine advanced technology, surgical precision, and compassionate care to help patients achieve clearer, healthier vision for years to come.
Office Information
Cali Eye Institute, Torrance, CA
19000 Hawthorne Blvd, Suite 100
Torrance, CA 90503
Tel: 310-909-8880
Office Hours
Monday-Thursday: 8:30am-5:00pm
Friday: 8:30am-4:30pm
Lancaster Eye Institute, Lancaster, CA
1739 W Avenue J
Lancaster, CA 93534
Tel: (661) 940-0555
Office Hours
Monday - Thursday: 8:30am-5:00pm
Friday: 8:30am-4:30pm
Anacapa Vision, Ventura, CA
1280 S. Victoria Ave., Ste. 160
Ventura, CA 93003-6504
Tel: (805) 658-3937
Office Hours
Mondays and Fridays: 8am-3pm
Tuesdays - Thursday: 8am-4pm
Frequently Asked Questions
What are refractive errors?
Refractive errors are vision problems that occur when the shape of the eye prevents light from focusing properly on the retina.
What are the main types of refractive errors?
The most common types are myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.
What causes refractive errors?
They are typically caused by the eye being too long, too short, or having an irregularly shaped cornea or lens.
Are refractive errors hereditary?
Yes. Genetics play a significant role, and individuals with a family history of refractive errors are more likely to develop them.
Can refractive errors get worse over time?
Yes. Prescriptions may change throughout childhood, adolescence, and adulthood depending on the specific refractive error.
Can LASIK correct refractive errors?
LASIK can effectively correct many cases of myopia, hyperopia, and astigmatism by reshaping the cornea.
How are refractive errors diagnosed?
A comprehensive eye examination including refraction testing and visual acuity measurements can accurately diagnose refractive errors.
When should I see an eye doctor for blurry vision?
You should schedule an eye examination whenever you notice persistent blurry vision, headaches, eye strain, or difficulty seeing clearly at any distance.
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