Digging Deep- II

#Day 2

Morning session:

The objective was to make everyone understand that team work can’t progress without the complete participation of all the team members. At the same time each team member should be responsible enough for themselves as well as others.

Post lunch:

·        1} Considering that the human eye has variable focal length, still how can they not zoom in/out ?

There are three basic parts of the eye: a light focusing system, an automatic aperture system, and a light sensitive detection system. In the light focusing system, the cornea and the lens account for the refractive power of the eye. Most of this power is due to the curvature of the cornea, but the muscles controlling the curvature of the lens provide the flexible focusing power of the eye. These eye, or ciliary, muscles permit the normal eye to focus on the retina light from objects very distant, essentially parallel rays of light, as well as light from objects as close as the normal near point of 25 cm from the eye.

The distance from the eye to the page at the nearest point of clear vision is the near-point vision. One has greater eye accommodation than normal if his near-point distance is less than 25 cm. The power of a lens is a measure of its ability to bend rays of light. A lens of high power has a small focal length.The human eye has a variable focal length so the eye can change its power to focus on objects at various distances from the eye.

Hence the power of the eye changes accordingly to accommodate objects at various distances from the eye.

·        2}.How can you focus after an eye surgery?

Refractive lens exchange, also called lens replacement surgery or clear lens extraction, may be a better option than LASIK, PRK or phakic IOLrefractive surgery for people with presbyopia and high hyperopia (farsightedness).

Refractive lens exchange (RLE) replaces your eye's clear natural lens with an artificial intraocular lens (IOL) to correct your refractive errorand achieve sharper focus, reducing your need forreading glasses or bifocals.

The procedure for refractive lens exchange is virtually identical to cataract surgery . The difference is that in RLE, the lens being replaced is clear, rather than a cloudy lens due to a cataract.

As in cataract surgery, three types of IOLs are available to replace your natural lens, depending on your vision needs and the health of your eyes. They are:

·         Monofocal fixed-focus IOLs. monofocal lenses provide clear vision at distance, intermediate or near ranges — but not all three at once.

·         Multifocal IOLs. A multifocal lens provides clear vision at multiple distances.

·         Accommodating IOLs. An accommodating IOL is a type of monofocal lens that enables focus at multiple distances by shifting its position in the eye.

With intraocular lenses, there is no "one size fits all," and your eye surgeon will recommend an IOL that is most suitable for your individual needs.

Each IOL has advantages and disadvantages in terms of the best uncorrected vision it produces at near, intermediate and far distances, as well as the likelihood and degree of vision disturbances such as halos and night glare that might occur after surgery.

Also, the results of one clinical trial are not directly comparable with those of another, as each study is conducted in a different way, often with differing endpoints and patient-enrollment criteria. Your eye surgeon will advise on the most suitable IOL for you.

Though I would still like to have a better and clear idea about the questions raised by Tanmay sir.As all these are way too scientific. It would be helpful if he can make me understand in simpler words.