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Dr Nicholas Caro on Refractive Surgery Updates

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Nicholas Caro MD, a leader in the field of Ophthalmology is the proud father of Dimitri Caro, Spiro Caro and husband of Peggy Caro

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What are "refractive errors" within the eye that cause vision problems?

Myopia:
Myopia, or nearsightedness, occurs when the eye has too much focusing power. Therefore, objects at a distance are blurry, whereas objects that are close can be clearly seen (unless astigmatism is present). Typically, the myopic eye is slightly longer or has a steeper cornea compared to the normal eye.

Myopia focuses light in front of the retina.

Hyperopia:
Hyperopia, or farsightedness, occurs when the eye lacks sufficient focusing power. This usually causes objects at a distance to appear blurry, and near objects are seen even less clearly. Typically, the farsighted eye is slightly shorter or has a flatter cornea than the normal eye.

Hyperopia focuses light behind the retina.

Astigmatism:
Astigmatism is a condition in which light rays in different orientations are brought to different points of focus. A useful analogy is the comparison of a basketball to a football. The surface of a basketball has equal curvature in all directions, whereas a football is flatter in one orientation and steeper in the other. The surface of the football represents the situation that is present in the cornea when the eye has astigmatism. This surface focuses light obliquely, so no true image forms on the retina.
Usually, the astigmatism occurs in the cornea. This often can be corrected with glasses or contact lenses, or in many instances, treated with refractive surgery.

Astigmatism focuses light in an oblique fashion, so no true image forms on the retina.

Presbyopia:
Presbyopia is a natural condition that typically becomes noticeable around age 45. In children and young adults, the crystalline lens inside the eye can easily look at a distant object and then increase its focus to look at a near object. As we get older, the lens inside of the eye loses this capacity to focus in and out. As this occurs, individuals find that they need to hold reading material at greater distances from them. Ultimately, reading glasses are needed, typically by the mid-40s.


Presbyopia focuses light behind the retina at near distances only. This is because the eye doesn't have the strength to "autofocus" at reading distances.

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What is refractive surgery?
Refractive surgery involves the use of lasers or other devices to treat the refractive errors of the eye.

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THOUGH LASIK IS A SAFE AND EFFECTIVE PROCEDURE THERE ARE KNOWN COMPLICATIONS. FOR A LIST OF THESE COMPLICATIONS YOU MAY VISIT THE FDA WEBSITE FOR LASIK OR DISCUSS WITH YOUR PHYSICIAN.

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Server Error in '/' Application.

Authentication failed because the remote party has closed the transport stream.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.IOException: Authentication failed because the remote party has closed the transport stream.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[IOException: Authentication failed because the remote party has closed the transport stream.]
   System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) +8357406
   System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) +186
   System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) +345
   System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest) +203
   System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult) +769
   System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) +355
   System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) +20
   System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) +82
   System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result) +1105
   System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size) +60
   System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size) +122
   System.Net.ConnectStream.WriteHeaders(Boolean async) +463

[WebException: The underlying connection was closed: An unexpected error occurred on a send.]
   System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) +365
   System.Net.WebClient.DownloadData(Uri address) +111
   RssToolkit.RssDownloadManager.DownloadChannelDom(String url) in c:\webnet\misc\dmitryr\rsstoolkit\sources\toolkit\RssDownloadManager.cs:49
   RssToolkit.RssDownloadManager.GetChannelDom(String url) in c:\webnet\misc\dmitryr\rsstoolkit\sources\toolkit\RssDownloadManager.cs:171
   RssToolkit.RssDownloadManager.GetChannel(String url) in c:\webnet\misc\dmitryr\rsstoolkit\sources\toolkit\RssDownloadManager.cs:182
   RssToolkit.RssChannelBase`2.LoadFromUrl(String url) in c:\webnet\misc\dmitryr\rsstoolkit\sources\toolkit\RssChannelBase.cs:30
   RssToolkit.GenericRssChannel.LoadChannel(String url) in c:\webnet\misc\dmitryr\rsstoolkit\sources\toolkit\GenericRssChannel.cs:38
   RssToolkit.RssDataSource.get_Channel() in c:\webnet\misc\dmitryr\rsstoolkit\sources\toolkit\RssDataSource.cs:51
   RssToolkit.RssDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) in c:\webnet\misc\dmitryr\rsstoolkit\sources\toolkit\RssDataSource.cs:86
   System.Web.UI.WebControls.Repeater.GetData() +326
   System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) +269
   System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) +80
   System.Web.UI.WebControls.Repeater.EnsureDataBound() +67
   System.Web.UI.WebControls.Repeater.OnPreRender(EventArgs e) +20
   System.Web.UI.Control.PreRenderRecursiveInternal() +162
   System.Web.UI.Control.PreRenderRecursiveInternal() +256
   System.Web.UI.Control.PreRenderRecursiveInternal() +256
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6875


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3930.0
 

Nicholas Caro MD, a leader in the field of Ophthalmology is the proud father of Dimitri Caro, Spiro Caro and husband of Peggy Caro

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