Reading glasses Reading glasses – Glasses designed to help with close-up tasks like reading, sewing, or using a smartphone. Reading glasses typically have single vision lenses with a positive diopter value, correcting the difficulty to focus on close objects caused by presbyopia.
Category Archives: Glossary
Visual acuity
Visual acuity Visual acuity – A measure of how clearly you can see details, often assessed using an eye chart during an eye exam. Visual acuity tests help determine the sharpness of your vision and are crucial in diagnosing refractive errors and other vision issues. It’s typically expressed as a fraction, such as 20/20 also …
Uveitis
Uveitis Uveitis – Inflammation of the uvea, the middle layer of the eye, which can cause symptoms like redness, pain, blurred vision and light sensitivity. Uveitis can be caused by infections, autoimmune diseases, or other conditions, and may require prompt treatment to prevent complications like glaucoma or vision loss.
UV filter lenses
UV filter lenses UV filter lenses – Lenses that block ultraviolet (UV) rays from the sun, protecting your eyes from potential damage, such as cataracts and other eye conditions. UV filter lenses are particularly important for outdoor activities and are available in both prescription and non-prescription options.
Transition lenses
Transition lenses Transition lenses – Another name for photochromic lenses, which change their tint based on the amount of UV light exposure. These lenses automatically adjust from clear indoors to dark outdoors, providing continuous comfort and UV protection without needing to switch between regular glasses and sunglasses.
Tear ducts
Tear ducts Tear ducts – Small channels located in the inner corners of your eyes that drain tears into your nasal cavity. Tear ducts help keep your eyes moist, remove debris and provide protection against infection. Blocked tear ducts can lead to watery eyes or infections and may require medical treatment.
Single vision lenses
Single vision lenses Single vision lenses – Lenses that have a single prescription across the entire lens, used to correct nearsightedness, farsightedness, or astigmatism. Unlike multifocal lenses, single vision lenses are designed to focus at one specific distance, either for seeing clearly at a distance or up close.
Retinal detachment
Retinal detachment Retinal detachment – A serious eye condition where the retina, the light-sensitive layer at the back of the eye, separates from the underlying tissue. Symptoms include a sudden increase in floaters, flashes of light, or a shadow over your field of vision. Retinal detachment requires emergency treatment to prevent permanent vision loss.
Pupils
Pupils Pupils – The black circular openings in the center of your eyes that control the amount of light entering the eye. Pupils dilate (expand) in low light to let in more light and constrict (shrink) in bright light to protect the retina. They play a key role in focusing and adapting to different lighting …
Pupillary distance
Pupillary distance Pupillary distance – This is the measurement from one pupil centre to the other pupil centre, measured in millimetres, important for ensuring that your lenses are correctly aligned with your eyes. Accurate pupillary distance is crucial for the effectiveness of your glasses, especially for tasks that require precision, like reading or computer work.