Skip to main content

WHY WE HAVE TWO EYES?

     


      Photos lack depth perception.  The above photo clearly illustrates that. Because the photos are shot with a single eye or lens

 .     We have two eyes separated by a distance of 2.5 inches.  The two eyes see the same scene or object in two different angles.  Hence two slightly different images fall on the retina of the eyes.  Brain process these images and gives the depth perception or third dimension.

      Thousands of years back, we required two eyes for hunting and to escape from wild animals.  Today, we require depth perception for crossing a busy road!!  Only using two eyes, we can estimate the distance of approaching vehicles and take a decision to cross the road. 

      Consider the birds like chickens and pigeons.  They have two eyes, one on the left side and the other on right side of the head.  Hence they get a 360-degree view of the world.  It will help them to easily escape from predators.  But there is a price to pay.  They lack binocular vision like us and lose depth perception.  To overcome this drawback, the birds always bob their heads.  When they move the heads up and down, they get two images. These images are processed by the brain and give them 3D -effect.

      Similarly, two ears give us depth perception in sound.  You can tell where the 'cry for help' is coming from, front or back, left or right.
         
Meanwhile - enjoy 2.0 -3D.
     Some people say we do not use the depth perception as much as a caveman (like Tarzan hoping from tree to tree).  Hence, evolution may wipe out our two eyes.  Instead, we may get a single eye at the centre of the head.  
---------------------------------------------------------------------------------

Comments

Post a Comment

Popular posts from this blog

Your heart -you do not know

  Size and Location: The human heart is roughly the size of a clenched fist and is located slightly to the left of the center of the chest. Despite its relatively small size, the heart plays a crucial role in pumping blood throughout the entire body. Heartbeat Variability: The heart does not beat at a constant rate. The interval between heartbeats can vary, and this variability is considered a sign of a healthy heart. Factors such as breathing, emotions, and physical activity influence the heartbeat. Electrical Conduction: The heart's contractions are controlled by electrical impulses. The sinoatrial (SA) node, often called the "natural pacemaker," generates electrical signals that regulate the heartbeat and coordinate the pumping of blood. Blood Pumping Capacity: On average, the human heart pumps about 2,000 gallons (or 7,570 liters) of blood each day. Over a lifetime, this amounts to pumping enough blood to fill several Olympic-sized swimming pools. Heart Chambers and V...
Post a Comment
Read more

THE WORK HORSE "="

    One cannot think of  a mathematical step without 'is equal to ' .  It balances right hand side and left hand side.  It aids simplification and manipulation of a mathematical expression. example: 2(A+B)  = C 2A+2B  = C         2A = C-2B           A = C-2B/ 2   In an electronic calculator,  the pressing of ' = " sign executes an asthmatic expression  or simply calculates.       In computer languages, it plays very important role.                                                                 A = B   When a computer looks at this expression, the value stored in the location named B is just transferred to the storage named A .  After execution both A and B will have the same value an...
Post a Comment
Read more

How does your smart phone detect motion, steps, rotation, and location?

 How it works-1  An accelerometer in a smartphone is a microelectromechanical system (MEMS) device that measures acceleration and tilt. It works by detecting changes in motion by measuring the vibration or acceleration of the device. The accelerometer consists of a small mass suspended on a spring inside a sealed chamber. When the device is subjected to acceleration, the mass moves relative to the device, causing a change in capacitance that can be measured and processed by the smartphone's hardware. The accelerometer measures acceleration in three dimensions (x, y, and z) and provides data that the smartphone's software can use to determine the device's orientation, detect motion, and track changes in velocity and acceleration. The accelerometer is used for a variety of purposes in a smartphone, including screen rotation, motion tracking for games and fitness apps, and detecting the position of the device for navigation and location services. Additionally, it can be used t...
Post a Comment
Read more