What is vascular attenuation?
Retinal vessel attenuation is recognized as an almost universal finding in eyes with RP, 1 and is mainly thought to reflect decreased metabolic demand of the degenerating retina, 2 where loss of oxygen consumption leads to increased local oxygen levels in the inner retina that in turn results in vasoconstriction.
Do cats have a fundus?
Cats may have a slightly different tapetal colour immediately surrounding the optic disc. The inferior half of the fundus is variably coloured by pigment in the retinal pigmented epithelium (RPE) and the choroid that obscures the underlying choroidal vessels.
Is human retina vascular or avascular?
Some vertebrates, including humans, have an area of the central retina adapted for high-acuity vision. This area, termed the fovea centralis, is avascular (does not have blood vessels), and has minimal neural tissue in front of the photoreceptors, thereby minimizing light scattering.
Which part of the retina has the greatest sensitivity to light?
The most light sensitive part of the retina is an area in the centre of the retinal surface which is packed with smaller sized hexagonal cone cells. This part is called the fovea centralis or simply the fovea.
What is Tigroid fundus?
1 : having a striped or spotted appearance pathological changes in the eye resulted in a tigroid fundus. 2 : being or consisting of Nissl substance.
Why is my cats 3rd eyelid showing?
Third Eyelids Are Visible: When a cat is waking or sleepy the third eyelids (or nictitating membranes) may be visible. Persistent protrusion of the third eyelid can be caused by problems of the eye(s) or nervous system. But it can also be seen in almost any cat that is just not feeling well.
What are the treatment options for a detached retina?
If your retina has detached, you’ll need surgery to repair it, preferably within days of a diagnosis. The type of surgery your surgeon recommends will depend on several factors, including how severe the detachment is. Injecting air or gas into your eye.
How does retinopexy work for retinal detachment?
Pneumatic retinopexy. If positioned properly, the bubble pushes the area of the retina containing the hole or holes against the wall of the eye, stopping the flow of fluid into the space behind the retina. Your doctor also uses cryopexy during the procedure to repair the retinal break.
What causes retinal detachment and reattachment in patients with hypertension?
Definitive cause of the scar cannot be determined based on this image. In patients with retinal detachment secondary to systemic hypertension, this appearance of the retina (ie, reattachment) is common after the patient undergoes proper blood pressure management.
How does a doctor check for retinal detachment?
The doctor may use an instrument with a bright light and special lenses to examine the back of your eye, including the retina. This type of device provides a highly detailed view of your whole eye, allowing the doctor to see any retinal holes, tears or detachments. Ultrasound imaging.