Scotopic Vision - CorneaCare
2022年12月15日 · Scotopic and Photopic Vision. Scotopic vision allows you to see in low lighting conditions, such as a dark room, with the use of rod-shaped photoreceptors. Photopic vision allows you to see in well-lit lighting conditions, such as normal daylight, with cone-shaped photoreceptors. Eyes contain two types of photoreceptors: rods and cones.
Deuteranopia Definition - CorneaCare
An Ishihara Color Test can be used to diagnose deuteranopia. The Ishihara Color Test requires the patient to look at a series of dots that make up a number. Individuals with normal vision will be able to see the dots, but the number will be invisible or difficult for those with deuteranopia. Deuteranopia Treatment
20/20 Vision Definition - CorneaCare
2022年12月12日 · For example, if you have 20/40 vision (the lowest visual acuity allowed for driving in most states), it means that you must be as close as 20 feet from a point to see what a person with normal vision can see at 40 feet.². What causes vision to be less than 20/20? Numerous eye conditions can lead to poor vision that results in less than 20/20 ...
Hypotony Definition - CorneaCare
2022年12月13日 · Understanding Hypotony. Someone with hypotony has intraocular pressure (IOP) less than 6.5 mm Hg (millimeters of mercury).¹ Patients with IOP below 5 mm Hg often experience vision loss.¹ Normal IOP is between 12-21 mm Hg.¹ In hypotony maculopathy, the low IOP causes changes to the back of the eye, including choroidal folds in the retina and optic …
Abbe Value - CorneaCare
2022年12月16日 · Scotopic Vision. refers to your eyes’ ability to see in low light levels Emmetropia. is an eye with no ...
Phoropter - CorneaCare
2022年11月5日 · This apparatus allows eye doctors to measure the natural eye alignment (phoria). Prism works by bending light, and moving the location of a perceived image. Prism testing can determine if the eye coordination is robust and is used to evaluate symptoms of double vision, eye strain, or headaches. Computerization
Dermatochalasis Definition - CorneaCare
2023年1月27日 · Dermatochalasis is a normal anatomical change with age. While dermatochalasis can affect an individual’s vision, often the concern is cosmetic. Dermatochalasis can have the appearance of being tired or cause a dull look to the face. Dermatochalasis may lead to corneal exposure and dry eye.
Leukocoria - CorneaCare
2022年12月15日 · In adults with leukocoria, symptoms will reflect the underlying cause of the white pupil. For instance, with cataracts, adult patients may also complain about blurry vision and glare. With retinal detachment, patients may experience flashes, floaters, and a “curtain-like” sensation over their vision.
Retinoschisis Definition - CorneaCare
Retinoschisis can affect both the central and peripheral vision. Central vision can be affected and acuity may range from 20/30 to less than 20/200. Vision loss is due to the formation of tiny cysts between the separated layers of the retina. These cysts often form a “spoke-wheel” pattern and can be very subtly seen on examination.
Neuronal Ceroid Lipofuscinosis - CorneaCare
2022年11月4日 · The most common type of neuronal ceroid lipofuscinosis that affects the eye is Juvenile Neuronal Ceroid Lipofuscinosis (JNCL), also known as Batten disease. Neuronal ceroid lipofuscinosis (NCL) disorders cause rapid vision loss, with profound vision loss occurring within the span of a few months.