The eye is the only part of the brain that can be seen directly – this happens when the optician uses an ophthalmoscope and shines a bright light into your eye as part of an eye examination.

The image formed on the retina is real and inverted. The retina comprises specialized cells that are sensitive to light, known as rod and cone cells. These cells get stimulated and send signals to the brain which turns them into erect images that allow us to see. So, the correct answer is ‘real and inverted’.

When light hits the retina (a light-sensitive layer of tissue at the back of the eye), special cells called photoreceptors turn the light into electrical signals. These electrical signals travel from the retina through the optic nerve to the brain. Then the brain turns the signals into the images you see.

The visual pathway refers to the anatomical structures responsible for the conversion of light energy into electrical action potentials that can be interpreted by the brain. It begins at the retina and terminates at the primary visual cortex (with several intercortical tracts).

The visual pathway consists of the retina, optic nerves, optic chiasm, optic tracts, lateral geniculate bodies, optic radiations, and visual cortex.

The primary visual pathway consists of the retina, optic nerve, lateral geniculate nucleus (LGN) of the thalamus, and the visual cortex of occipital lobe. Each of these structures function in sequence to transform the visual signal, leading to our visual perception of the external world.

Light enters the eye through the cornea. This is the clear, dome-shaped surface that covers the front of the eye. From the cornea, the light passes through the pupil. The iris, or the colored part of your eye, controls the amount of light passing through.

Accommodation is the process of changing the shape of the lens to focus on near or distant objects. To focus on a near object – the lens becomes thicker, this allows the light rays to refract (bend) more strongly. To focus on a distant object – the lens is pulled thin, this allows the light rays to refract slightly.

Conjunctiva – the transparent mucous membrane that lines the inner surfaces of the eyelids and covers the sclera, except at the cornea. Conjunctivitis – an inflammation or infection of the conjunctiva. Also known as “pink eye.”

By far the most important organs of sense are our eyes. We perceive up to 80% of all impressions by means of our sight. And if other senses such as taste or smell stop working, it’s the eyes that best protect us from danger.

The conjunctiva is a clear mucous membrane that covers the inner surface of the eyelid and the outer surface of the eye. The conjunctiva secretes a watery fluid (mucus) that helps lubricate the eyeball and keep it moist.

An eyelid is a thin fold of skin that covers and protects an eye. The levator palpebrae superioris muscle retracts the eyelid, exposing the cornea to the outside, giving vision. This can be either voluntarily or involuntarily.

While there are still surgical options available, nonsurgical treatment — also known as nonsurgical blepharoplasty — is also on the rise. These types of nonsurgical brow lifts may come in the form of injections, such as Botox and dermal fillers, which help to create the appearance of a skin lift without any surgery.

The main role of the eyelids is to protect the eye. It’s vital that the surface of the eye (the cornea) remains constantly moist, so the eyelid is responsible for spreading the tear film evenly across the surface. When we sleep, the eyelids don’t simply block out light, they keep the cornea from drying out.

In technical terms, a double eyelid is the presence of a supratarsal eyelid crease. The term “double eyelid” is used to contrast “monolid,” which refers to lids that don’t have that crease. While monolids are often associated with people of Asian descent, double eyelids are actually more common than you might think.

Among people of Chinese descent, the creation of a supratarsal crease (“double” eyelid blepharoplasty) is the most common cosmetic surgical procedure, but no comparative study has assessed the height by which an upper eyelid crease is deemed most attractive and depending on cultural background.

There are also nonsurgical options for creating double eyelids. Keep in mind, there’s nothing medically wrong with double or single eyelids — both are entirely normal.

Although less variable than eyelid retraction, the protrusion of the eye can return to normal on its own. After being stable for several months or more, it is sometimes desirable to surgically move the eye into a more normal position.

Here is the list of home remedies to prevent and minimise the problem of sagging lids.

1. Cucumbers. Not just for salads, cucumbers are an excellent remedy for drooping eyelids.
2. Chamomile Tea Bags.
3. Ice Water or Cubes.
4. Homemade Lotion.
5. Eat Grapes.
6. Egg white mask.
7. Olive oil.
8. Drink water.

Getting rid of under-eye lines and wrinkles at home

1. Try facial exercises to tighten skin. Certain facial exercises have been shown anecdotally to be effective at tightening the skin underneath your eyes.
2. Treat your allergies.
3. Gently exfoliate.
4. Avoid sun exposure — use sunscreen and a hat.
5. Eat a healthy diet.

Some conditions, like droopy eyelids, can gradually interfere with your eyesight. Not only do droopy eyelids make you look sad or tired, they can actually limit your field of vision. There are two eye conditions that can cause your eyelids to droop and reduce your vision: dermatochalasis and ptosis.

The best and most satisfying treatment for this problem is an upper eye lift, or upper blepharoplasty, which reduces the amount of skin on the upper eyelid.” Blepharoplasty is the second most common plastic surgery operation in the UK, and Mr Ramakrishnan says patients are normally very satisfied with the results.

10 Best Eye Creams For Droopy Eyelids

• Filorga Time-Filler Eyes Absolute Eye Correction Cream.
• Sudden Change Eyelid Lifter Crème.
• L’Oréal Paris Revita Lift Double Lifting Eye Cream.
• Garnier SkinActive Ultra-Lift Anti-Wrinkle Eye Cream.
• Avon Anew Clinical Eye Lift Pro Dual Eye System.
• Derma-E Firming DMAE Eye Lift Cream.

L’Oréal Paris Revita Lift Double Lifting Eye Cream The lifting eye gel is formulated with Pro-Tensium E that tightens the sagging skin on the upper eyelids caused by age and gravity.