Laser vision correction often uses an excimer laser that produces 193-nm electromagnetic radiation. This wavelength is extremely strongly absorbed by the cornea and ablates it in a manner that reshapes the cornea to correct vision defects. Explain how the strong absorption helps concentrate the energy in a thin layer and thus give greater accuracy in shaping the cornea. Also explain how this strong absorption limits damage to the lens and retina of the eye.

Question

Laser vision correction often uses an excimer laser that produces 193-nm electromagnetic radiation. This wavelength is extremely strongly absorbed by the cornea and ablates it in a manner that reshapes the cornea to correct vision defects. Explain how the strong absorption helps concentrate the energy in a thin layer and thus give greater accuracy in shaping the cornea. Also explain how this strong absorption limits damage to the lens and retina of the eye.

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Science
Physics

Electromagnetic Waves

Related Physics Q&A

Find answers to questions asked by students like you.

Q: Mark and David are loading identical cement blocks onto David’s pickup truck. Mark lifts his block s...

A: The work done is given as the change in potential energy.                      W =P -  P0 where, P0 ...

Q: A bicyclist starting at rest produces a constant angular acceleration of 1.50 rad/s? for wheels that...

A: Click to see the answer

Q: Consider the following mass distribution where the x- and y-coordinates are given in meters: 5.0 kg ...

A: The expression for the x-coordinate of the fourth object,

Q: Light has been argued to be a wave and then a particle, and then back again. Does this indicate that...

A: According to the corpuscular theory Newton concluded that light is a group of particle and at the sa...

Q: (a) If the wavelength of an electron is 5.00 × 10−7 m, how fast is it moving? (b) If the electron ha...

A: Given:  wavelength = 5 x 10-7 m  velocity = 1 x 107 m/s 

Q: Please show all steps in clear handwriting. No cursive if possible.

A: Consider the figure.

Q: A house is 50.0 ft long and 26 ft wide and has 8.0-fthigh ceilings. What is the volume of the interi...

A: Given:  length,L = 50 ft  width, W = 26 ft  height, H = 8 ft 

Q: A 3.00-mol sample of helium gas initially at 300 K, and 0.400 atm is compressed isothermally to 1.80...

A: a) The ideal gas law gives, Rearranging the equation,

Q: A heat pump using refrigerant-134a heats a houseby using underground water at 8°C as the heat source...

A: The enthalpy at the inlet of the compressor (using given values with data from A-13),

Q: The diagram shows a uniform wire XY. Find the potential difference shown by the voltmeter across the...

A: Click to see the answer

Q: What power of spectacle lens is needed to correct the vision of a nearsighted person whose far point...

A: Given: distance of image, v = - (30 - 1.5) = - 28.5 cm  distance of object, u = infinity

Q: Could you help with 3 and 4?

A: II. (3) Suppose the glider A1 moved in the left direction after the collision. The final momentum (P...

Q: What are Fraunhofer lines?

A: Given:  Fraunhofer lines 

Q: Consider an airplane whose takeoff speed is 220 km/h and that takes 15 s to take off at sea level. F...

A: An aircraft will takeoff when the lift is equal to the total weight,

Q: A ball with an initial velocity of 8.00 m/s rolls up a hill without slipping. Treating the ball as a...

A: Given; The initial velocity of the ball, v = 8 m/s. Consider the ball as a spherical shell. 

Q: i need a solution with use vectors and show details

A: Click to see the answer

Q: How does regeneration affect the efficiency of a Brayton cycle, and how does it accomplish it?

A: By adding heat to the system, the regeneration increases the cycle efficiency of a Brayton cycle.

Q: A disc with 0.6 kg m^2 moment of inertia is free to rotate about its center. Two forces F1=5N and F2...

A: The expression for the required angular acceleration,  

Q: On a z-shaped tube water is flowing with 4 m/s at the bottom and 3 m/s at the top. The pressure at t...

A: Click to see the answer

Q: A 10 cm wire carrying a current of 20 A is placed in a uniform magnetic field of 0.3 T. ifthe wire m...

A: Given:  length,l = 10 cm = 0.1 m  current,i = 20 A  magnetic field ,B = 0.3 T  Angle between field a...

Q: A 19 cmcm radius air duct is used to replenish the air of a room 7.6m×6.7m×3.8m every 15 min. How fa...

A: The rate of airflow equals the area times the speed of the airflow. Now,

Q: A parallel plate capacitor having area 35 cm? and plate spacing 1.5 mm is charged to a potential dif...

A: Click to see the answer

Q: Can you please help with the attached question? Thanks!

A: Given :  initial state, n = 8  wavelength of emitted photon, λ = 19062 nm 

Q: Figure shows the resistors from the previous two examples wired in a different way—a combination of ...

A: Hello. Since your question has multiple sub-parts, we will solve the first three sub-parts for you. ...

Q: The total cross-sectional area of the load-bearing calcified portion of the two forearm bones (radiu...

A: The expression for the compressional stress in the arm is,

Q: Q1/ Due to a jaw injury, a patient must wear a strap as in the figure below that produces a net upwa...

A: Click to see the answer

Q: Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands...

A: The expression for the resistance of the wire,

Q: An object of mass is raised from the surface of the Earth to a height equal to the radius of the Ear...

A: Click to see the answer

Q: A 650-kg elevator starts from rest and moves upward for 3.00 s with constant acceleration until it r...

A: Click to see the answer

Q: On a steamy mirror, wipe away just enough to see your full face. How tall will the wiped area be com...

A: The light meets the mirror half way up to your eyes when the light from the bottom of your face reac...

Q: As a woman walks, her entire weight is momentarily placed on one heel of her high-heeled shoes. Calc...

A: Given, Area=1.5 cm2=1.5x10-4 m2 Mass =55 kg Weight=55x9.8=539N

Q: A very myopic man has a far point of 20.0 cm. Whatpower contact lens (when on the eye) will correct ...

A: Click to see the answer

Q: Using an ohmmeter, a student measures the resistance between various points on his body. He finds th...

A: An ohmmeter is a device used to measure resistance between two points in a circuit. The factors on w...

Q: Two plate fins of constant rectangular cross section are identical, except that the thickness of one...

A: Click to see the answer

Q: A football punter accelerates a football from rest to a speed of 10 m/s during the time in which his...

A: Given:  initial velocity, u = 0  m/s  final velocity, v = 10  m/s  time, t = 0.2 s  mass, m = 0.5 kg...

Q: An elevator cab that weighs 27.8 kN moves upward.What is the tension in the cable if the cab’s speed...

A: Click to see the answer

Q: Find the magnitudes of velocities vA and vB Find the components of vtot along the x- and y-axes ". F...

A: From the figure, the total velocity

Q: Answer the following questions for projectile motion on level ground assuming negligible air resista...

A: Given: A projectile motion 

Q: As shown in the figure, calculate the magnetic field that will be formed at the point A of the circu...

A: given: radius, r =  5 cm  current, i = 10 A 

Q: If you look with a magnifying glass at pictures printed in full color in this or other books or maga...

A: Given: Some colours 

Q: The flywheel of a steam engine runs with a constant angular speed of 112 rev/ min . When steam is sh...

A: Click to see the answer

Q: P1B.7 Calculate the escape velocity (the minimum initial velocity that will take an object to in nit...

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If y...