The sclera, choroid and retina constitute the three layers of the human eye. The Retina, the sensory layer of the eye, comprises two cell types – cones and rods. The macula lutea or yellow spot is in the retina – a tiny elevation of the retina seen near the blind spot, having a high resolution.
The yellow spot is at the centre of the retina, comprising the cones only, thus imparting the yellow appearance. On the other hand, the blind spot is located posteriorly, where the optic nerves exit the eye. The blind spots lack rods and cones; as a result, the portion of the image that falls in this area is not perceived.
- These are oval-shaped, pigmented regions found in the centre of the retina
- As these spots absorb blue and UV light entering the eye in excess, it is called so
- The yellowish appearance is a result of their content of zeaxanthin and lutein, which are yellow coloured xanthophyll carotenoids
- These special structures possess high acuity vision as it contains high-density cones
- These regions are involved in high resolution, colour vision, possibly in a fair amount of light; they are light-sensitive
- It is a region present on the retina, a visual field lacking light-detecting photoreceptors on the optic disc wherein the optic nerve fibres pass through the optic disc
- Since it lacks cells to detect light on the optic disc, the related part of this field of vision is not visible. Consequently, the part of the image falling on the field of vision does not get perceived as it lacks photoreceptors
- It is this very region wherein the main blood vessels supplying blood to the retina enter
Key Difference between Yellow Spot and Blind Spot
The table below depicts the difference between Yellow Spot and Blind Spot.
|These are pigmented regions found in the centre of the retina, comprising densely packed photoreceptor cells
|These are natural spots on the retina lacking light-detecting photoreceptor cells
|In the posterior pole of the eye, lateral to the blind spot
|At the point of origin of the optic nerve
|Yes, a shallow depression at its middle, the fovea centralis
|Yes, cones only
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