The retina is the third and inner coat of the eye which is a light-sensitive layer of tissue. The optics of the eye create an image of the visual world on the retina (through the cornea and lens), which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses. These are sent to various visual centres of the brain through the fibres of the optic nerve.
For vision, these are of two types of photoreceptor cells: the rods and cones. Rods function mainly in dim light and provide black-and-white vision while cones support the perception of colour.
The retina has ten distinct layers In adult humans. The entire retina contains about 7 million cones and 75 to 150 million rods. An image is produced by the patterned excitation of the cones and rods in the retina. The cones respond to bright light and mediate high-resolution colour vision during daylight illumination (also called photopic vision). Rods respond to dim light and mediate lower-resolution, monochromatic vision under very low levels of illumination (called scotopic vision/ night vision). The illumination in most office settings falls between these two levels and is called mesopic vision.
Central retinal artery supplies 15% from inner retinal layer. As per clinical examination of photoreceptors; form and spatial vision, measured by visual acuity and it reflects rod and cone distribution.
Colour vision testing, one of the commonest investigations carried out by ophthalmologists is indicative of cone function and associated processing of the signals and identifies conditions related to colour vision.
DEAR DOCTOR DEDHIA & ALL AT LASER EYE CENTER ;
It is been a wonderful experience to know you all and also to be treated by such a friendly and excellent team of professionals. What you all have done for me is just inexplicable all can say is "Thank you so much" for doing this wonder on my eyes.
It really feels great to have an aid less vision.
May God bless all of you all health and happiness and wish you all the very best for your work!
It's been a month since the LASIK surgery and i feel quite relieved not having to bother with contact lenses, glasses and not being able to see. Now, I feel good coz I can see clearly with no hassles, and relieved from glasses after 10 years.
I am writing how I feel after having LASIK surgery.
I had surgery 6 months ago (4/2002). Before that my eyesight was not so seriously bad but I needed glass in lectures in college. It was headache to wear glasses during hot season as glasses came down up to half of my nose. So usually I didn’t wear glasses except lectures. But, I think, I missed half of my life which pleased me without seeing things around me clearly.
Now after surgery, my life has changed. I can see whatever I want to see without any irritation (wearing glasses). I feel I can enjoy daily life double. It is worth much more than I paid for the surgery. In Japan it costs 4 times. I have recommended my Japanese friends living in India. They are also interested in Lasik and I hope they will come to have surgery to Dr. Niteen. Comfortibility can change life.
I really appreciate Dr. Niteen & his all staff.