The NAD Team has come up with a list of honors that can possibly be earned at home during the COVID-19 shut-down. Check it out! El liderazgo de la División Norteamericana he creado una lista de especialidades que posiblemente se pueden desarrollar en casa durante la cuarentena del COVID-19.¡Búsquelo aquí!

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Sight
British Union
Skill Level 1
Year of Introduction: 2020

## 1.

### a. Perform this activity. Be blindfolded. Let someone place an item between 15 metres to 20 metres away from you. Now search for the item. Record the time you found the item. Now, be blindfolded again. Let someone place the item somewhere else but within the same distance as before. Take off your blindfold. Search for the item. Record the time you found the item.

 Distance of item from you (metres) Time you found the item (seconds) When blindfolded When not blindfolded

## 2. Anatomy of the eye. Label the parts.

Eye Function Drag
Click on the link provided above and do the exercise on the functions of the parts of the eye. When complete check your answer. The system will then mark your work. Print and paste your work.

## 3. How does a lens work? Complete the sentence below using the words from the box.

### We have a lens in each of our _______________. This is a ______________ lens. The job of this lens is to ______________ the ________________ so we can_____________________. The point at which the rays cross is called the focus or the ____________________. The light is ________________________as it goes into the and as it comes back out.

 eyes refracted light focal point focus see convex

## 4. Watch video:

### a. Below are the steps in how humans see. Arrange them in a chronological order by putting numbers (1, 2, 3, 4, 5, 6) in the “position” column to reflect the right order in which they should be.

 Position Steps When you look at an object, light reflected from the object goes through the pupil of your eye. Your brain sorts the image out so you see it the right way round. The cornea and the lens focus the light onto the retina. An inverted image is formed on the retina. The retina is made of light sensitive cells called photoreceptors. The iris, a muscle that controls the size of the pupil, allows the correct amount of light to enter your eye. When the image forms on the photoreceptors in the retina, chemical reactions produce and electrical impulse that travels up the optic nerve to your brain.

### c. Visual acuity test, visual field test and tonometry test are tests that an ophthalmologist performs on the eye. Match the name of the term to its meaning:

 Visual acuity test ????? A person reads an eye chart to measure how well he or she sees at various distances. Visual field test ????? This test determines the fluid pressure inside the eye to evaluate for glaucoma. Tonometry test ????? Ophthalmologists use this test to measure side, or peripheral, vision.

## 6.

### a. Compare the key features of the eye and a camera by finishing the table.

 Feature in a camera Feature in an eye Use Pupil Lens Shutter Retina Receives light

## 10. Fill in the blanks: (Watch the video - https://youtu.be/ypF037wlYZg)

### g. Read Genesis 48:10. Which of the refractive errors did Israel have?

Genesis 48:10 (NKJV)
Now the eyes of Israel were dim with age, so that he could not see. Then Joseph brought them near him, and he kissed them and embraced them.

## 14. Explain 1 Samuel 16:7.

1 Samuel 16:7 (NKJV)
But the Lord said to Samuel, “Do not look at his appearance or at his physical stature, because I have refused him. For the Lord does not see as man sees; for man looks at the outward appearance, but the Lord looks at the heart.”

## 15. Explain “fixing our eyes on Jesus.” (Hebrews 12:2)

Hebrews 12:2 (NKJV)
looking unto Jesus, the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God.

## 17. Optical illusion:

### _____________ Illusions can use colour, ______________ and patterns to create ___________ that can be deceptive or misleading to our _____________. The information gathered by the eye is processed by the brain, creating a perception that in reality, does not match the true image. Perception refers to the interpretation of what we take in through our _____________. Optical illusions occur because our brain is trying to _______________ what we see and make sense of the world around us. Optical illusions simply trick our brains into seeing things which may or may not be _____________.

 images eyes brains optical real light interpret