2nd Yr OCAP — 1/3 Retina Characteristics

A phenomenon where you can only see your own structure?

Entoptic Phenomenon

The retina takes up ___ of the eye?

Posterior 5/6

The retina hosts what type of tissue?

The retina has light sensitive tissues, also known as Photoreceptors

How do we see the world around us?

Our nerve fibers send electrical signals to the brain interpreting it as visual images.

The retina has __ distinct regions? Which are?

1. Optic Disc

2. Macula Lutea

3. Peripheral Retina

It is considered as our blind spot?

Optic Disk

Cells present in the Optic Disc accumulate and exit, these cells are?

Ganglion Axon Cells.

The shape of the optic disc? Horizontally and Vertically? And distance nasal to the fovea centralis?

H: 1.7mm

V: 1.9mm

3.5mm Nasal to the fovea centralis

The optic disk contains?

Contains a central cup, peripheral disk margin and retinal vessels. With a ratio of 0.3

If the Cup-disk ratio is larger than 0.3 that means?

The px has glaucoma

Macula Lutea is also known as? What is its diameter too?

Known as the “Yellow Spot” a dark area 5.5mm in diameter at the posterior pole of the eyeball, temporal to the optic disk.

How do we spot the macula?

The px must look near.

Between the three distinct regions — which is the most sensitive, why?

The macula lutea, due to the presence of cone receptors, our daytime vision (photopic vision)

Located in the center most part is with the cleanest vision is the?

The Fovea Centralis

The Fovea Centralis is located where? And is vascular or Avascular?

within the macula lutea, Avascular

The fovea centralis, receives nutrients by and from?

Via diffusion, provided by the choriocapillaries.

What gives the fovea centralis the cleanest vision?

Due to only having cones present, giving it the site of the highest visual acuity.

Center of the foveola is?

Umbo, the tiny depression at the center.

Foveola has a diameter and is located where?

Diameter of 0.35mm, at the central floor.

Ora Serrata is?

The junction between the retina and the ciliary body.