A person with presbyopia has lost some or all of the ability to accommodate the power of the eye. If such a person’s distant vision is corrected with LASIK, will she still need reading glasses? Explain.

Short Answer

Expert verified

Presbyopia affects the vision to focus on nearby objects, so if a person with presbyopia is treated with LASIK to correct his distant vision, then the presbyopia has not been corrected, and consequently, he needs glasses to read.

Step by step solution

01

Concept Introduction

LASIK eye surgery is the most well-known and widely used laser refractive surgery for vision correction. LASIK (laser-assisted in situ keratomileuses) is a procedure that can be used instead of glasses or contact lenses.

A unique form of cutting laser is used during LASIK surgery to accurately alter the shape of the dome-shaped transparent tissue at the front of your eye (cornea) to enhance vision.

02

Presbyopia definition

Presbyopia is presented by the aging of the eye which results in the eye progressively losing the ability to focus on nearby objects, usually due to difficulty reading small letters forcing the person to move the reading material to a distance where it can read clearly.

03

Need for reading glasses

These types of conditions can be corrected by prescribing glasses or through LASIK. The LASIK cornea correction procedure consists of emitting multiple bursts of finely controlled ultraviolet radiation by a laser of 193 nm wavelength, each laser is carefully controlled by a computer program at a rate of 10 bursts per second.

If a person's distant vision is corrected with LASIK, then you need glasses to read because distant vision is not used to read. For a reading of the text, the accommodation vision or near vision is used.

Therefore, after the LASIK procedure reading glasses are required.

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Most popular questions from this chapter

(a) Where does an object need to be placed relative to a microscope for its 0.500 cmfocal length objective to produce a magnification of -400? (b) Where should the 5.00 cm focal length eyepiece be placed to produce a further fourfold ( 4.00 ) magnification?

Your friends show you an image through a microscope. They tell you that the microscope has an objective with a \({\rm{0}}{\rm{.500}}\) cm focal length and an eyepiece with a \({\rm{5}}{\rm{.00}}\) cm focal length. The resulting overall magnification is\({\rm{250,000}}\). Are these viable values for a microscope?

Unless otherwise stated, the lens-to-retina distance is 2.00 cm.

People who do very detailed work close up, such as jewellers, often can see objects clearly at much closer distance than the normal 25 cm.

(a) What is the power of the eyes of a woman who can see an object clearly at a distance of only 8.00 cm?

(b) What is the size of an image of an 1.00 mm object, such as lettering inside a ring, held at this distance?

(c) What would the size of the image be if the object were held at the normal 25.0 cm distance?

Repeat the previous problem for glasses that are 1.75 cm from the eyes.

Consider a telescope of the type used by Galileo, having a convex objective and a concave eyepiece as illustrated in Figure 26.23(a). Construct a problem in which you calculate the location and size of the image produced. Among the things to be considered are the focal lengths of the lenses and their relative placements as well as the size and location of the object. Verify that the angular magnification is greater than one. That is, the angle subtended at the eye by the image is greater than the angle subtended by the object.

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