This item will be sent through the Global Shipping Programme and includes international tracking. Items delivered internationally may be subject to customs processing depending on the item's declared value. Youa€™ll see an estimated delivery date - opens in a new window or tab based on the sellera€™s dispatch time and delivery service. Will usually dispatch within 2 working days of receiving cleared payment - opens in a new window or tab. Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. By submitting your bid, you'll be contractually committing to buy this item from the seller if you are the winning bidder.
By submitting your bid, you're committing to buy this item from the seller if you're the winning bidder. By clicking Confirm, you commit to buy this item from the seller if you are the winning bidder.
By clicking Confirm, you're committing to buy this item from the seller if you're the winning bidder and have read and agree to the Global Shipping Programme terms and conditions - opens in a new window or tab.
By clicking 1 Click Bid, you are agreeing to buy this item from the seller if you're the winning bidder. Refraction occurs when light enters (or leaves) a medium with a different (optical) density at an angle of less than 90o. The cornea, aqueous humor, lens, vitreous humor and air all have different refractive indices, so light refracts as it passes from one to the other.


3.7 Students learn to distinguish between myopia and hyperopia and outline how technologies can be used to correct these conditions. Myopia can be corrected by wearing concave spectacles or contact lenses or by refractive eye surgery. LASIK (Laser-Assisted in situ keratomileusis) involves making a very thin slice in the front of the cornea, shaping the underlying cornea using an excimer laser, then replacing the flap. PRK (Photo Refractive Keratectomy) and LASEK (Laser Epithelial Keratomileusis) involve shaping the outer surface of the cornea using an excimer laser. Phakic IOL (Inter-Ocular Lens) is the placement of a lens behind the cornea and in front of the iris. Depth perception is possible because we have binocular vision - there is overlap (~ 120o) between our two eyes. Photo pairs allow the same depth perception because each photo is taken by a separate camera, both aimed at the same point. Stereo pairs with practice you can make the two images overlap (you will see three images - the centre one is 3-D).
The cloudy lens must be removed (either whole or after phacoemulsification with ultrasound) then replaced with an interocular lens. This dot point will be (has been) covered in practical lessons.A A  Refer to your Practical Record Book showing how changes in the curvature of a convex lens affects its focal length. 3.7A  Students learn to distinguish between myopia and hyperopia and outline how technologies can be used to correct these conditions. Stereo pairs with practice you can make the two images overlap (you will see three images - the centre one is 3-D).A  Placing a card between the photo pairs will allow you to see just one image.


Delivery times may vary, especially during peak periods and will depend on when your payment clears - opens in a new window or tab.
Contact the seller- opens in a new window or tab and request a postage method to your location.
Find out more about your rights as a buyer - opens in a new window or tab and exceptions - opens in a new window or tab. You've read and agree to the Global Shipping Programme terms and conditions - opens in a new window or tab. Import charges previously quoted are subject to change if you increase your maximum bid amount. 39 to 59 diopters), a young adult about 4 diopters, a 45 year-old less than 2 diopters and by 70, 0 diopters. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. Import charges previously quoted are subject to change if you increase you maximum bid amount. Each eye then gives a slightly different image of an object that both eyes are focussed on.



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