The autorefractor is a computerized device that quickly estimates your eyeglass prescription by measuring how light changes as it enters your eye. This test provides an objective starting point for determining refractive errors such as nearsightedness, farsightedness, and astigmatism. By obtaining an automated measurement, your eye doctor can refine your prescription more efficiently during a manual refraction test.
A slit lamp is a high-powered microscope that allows your eye doctor to examine the front and back parts of your eye in great detail. This test helps detect and diagnose various eye conditions, including cataracts, corneal abnormalities, dry eye disease, and infections. It is an essential part of routine eye exams, as well as specialized assessments for contact lens wearers and individuals with chronic eye conditions.
Extended ophthalmoscopy provides a highly detailed view of the retina, optic nerve, and surrounding structures at the back of the eye. This test is particularly useful for diagnosing and managing conditions such as retinal detachment, diabetic retinopathy, macular degeneration, and glaucoma. It is often performed when a standard eye exam reveals abnormalities that require closer evaluation.
A lensometer is a device used to measure the prescription of existing eyeglasses, including sphere, cylinder, axis, and progressive or bifocal lens power. This is especially useful when verifying a patient's current glasses, checking the accuracy of new lenses, or determining whether an updated prescription is needed. Opticians use a lensometer to ensure precise lens placement and optimal visual clarity.
Stereopsis, or depth perception, is the ability to perceive the world in three dimensions. This test assesses how well both eyes work together to judge distance and spatial relationships. It is particularly important for tasks that require precise visual coordination, such as driving, playing sports, or operating machinery. It can also help detect binocular vision issues, such as amblyopia (lazy eye) or strabismus (eye misalignment).
The cover test is a simple but effective way to detect eye misalignment, such as strabismus (crossed or turned eyes) and phorias (hidden eye misalignments). During this test, one eye is covered at a time while the patient focuses on a distant or near object. The doctor observes how the uncovered eye moves, helping diagnose conditions that may lead to vision problems, double vision, or difficulties with depth perception.
The color vision test determines a person's ability to perceive colors accurately. This is commonly done using Ishihara plates, which contain numbers or patterns hidden within colored dots. The test helps identify color deficiencies, such as red-green color blindness, which can affect daily activities and certain career choices, including those in aviation, graphic design, and electrical work.
Corneal topography is a specialized imaging technique that maps the curvature and shape of the cornea, the clear front surface of the eye. This test is essential for diagnosing conditions like keratoconus, fitting specialty contact lenses, and planning refractive surgeries such as LASIK. By creating a detailed map of the cornea, eye doctors can customize treatments for optimal vision correction and eye health.
The visual acuity test is the standard eye exam that measures how clearly you can see at different distances. Patients read letters from a Snellen eye chart, which helps determine the need for glasses or contact lenses. This test is fundamental in diagnosing nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. It is also used in vision screenings for driving and workplace safety.
A digital pupilometer is a precision instrument used to measure the distance between a patient’s pupils, known as the pupillary distance (PD). This measurement is crucial for ensuring that prescription eyeglass lenses are correctly centered over the eyes. Proper alignment improves visual clarity and comfort, especially for progressive or high-prescription lenses.
Optos technology is based on the principle of ultra-widefield retinal imaging, which allows for a wider and more detailed view of the retina compared to traditional imaging techniques. The Optos system consists of a specialized camera that captures high-resolution images of the retina using scanning laser ophthalmoscopy (SLO) and optical coherence tomography (OCT) technologies. SLO provides a wide-field view of the retina, while OCT allows for cross-sectional imaging, providing valuable insights into the various layers of the retina.
There are various methods of tonometry testing, but many eye doctors use either Goldmann tonometry, which is the conventional technique to measure eye pressure, or electronic tonometry.
Visual field testing is an important part of most standard comprehensive eye exams. Also sometimes known as perimetry testing, Visual field testing is a method to measure the entire scope of vision of an individual, including their peripheral/side vision.
Optical Coherence Tomography is a non-invasive imaging test that may be performed as a standard part of your regular, comprehensive exams, or you may be able to request this test as an addition to your usual exam.