This audio-integrated reading passage introduces Grade 4 students to the physical science concept of how lenses bend light to form images, aligned with NGSS standard PS4.B. Students explore how the human eye uses a lens to focus light onto the retina and discover why some people need eyeglasses to see clearly. The passage explains in simple, age-appropriate language how eyeglass lenses refract light to correct focusing problems, helping images land exactly on the retina. Through real-world examples and clear explanations, students build foundational understanding of light behavior and lens function. The passage includes bolded vocabulary terms with immediate definitions, making complex optical concepts accessible to fourth graders. Accompanying activities include comprehension questions, writing prompts, and graphic organizers that reinforce understanding of cause-and-effect relationships in vision correction. This resource supports hands-on investigations and classroom discussions about light, lenses, and how technology helps solve human problems.
Written by Workybooks TeamPublished by Workybooks
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Our eyes work like cameras to help us see the world around us. Inside each eye is a clear, curved part called a lens. A lens is a curved piece of material that bends light to make images. The lens in your eye bends light rays that come in through the front of your eye. These light rays need to land on a special spot at the back of your eye called the retina. The retina is like a screen that captures the image. When light lands exactly on the retina, you see a clear picture.
Sometimes a person's eye lens does not bend light the right way. The light might land in front of the retina or behind it instead of right on it. When this happens, everything looks blurry. This is when eyeglasses can help. Eyeglasses have special lenses that refract light, which means they bend it. Refract means to change the direction light travels. The eyeglass lenses bend the light before it enters the eye, fixing the problem.
Different people need different eyeglasses because their eyes have different focusing problems. Some people cannot see things far away clearly, while others have trouble seeing things up close. Eye doctors measure exactly how much each person's eye lens needs help. Then they create a prescription, which is a special set of instructions for making lenses with just the right shape. The correct lens shape bends light so it lands perfectly on the retina, and the person can see clearly again.
What is a lens?
A curved part that bends lightThe back screen of the eyeA type of eyeglass frameThe colored part of the eye
Where does light need to land?
On the front of the eyeOn the retinaOn the eyeglass lensIn front of the eye
What does refract mean?
To make light brighterTo stop light completelyTo bend lightTo reflect light backwards
Why do some people see blurry?
Their eyes are too smallLight lands in the wrong placeThey have no retinaTheir eyes are too big
How do eyeglasses help people see?
They make eyes biggerThey add more lightThey bend light before it entersThey change the retina shape
What does a prescription tell?
What color eyeglasses to buyWhat lens shape is neededHow to clean eyeglassesWhen to wear eyeglasses
All people need the same eyeglass prescription.
TrueFalse
What is the retina?
The screen-like back of the eyeThe front of the eyeballThe colored part of the eyeThe eyeglass lens