#optical center

According to the National Eye Institute, there are three types of contact lenses: soft lenses and hard lenses, both available in daily or extended wear. Additionally, there are other benefits to contact lenses, including:

Contacts are easier to wear when participating in sports or events in which you move around quickly

Contacts do not fog up the way glasses do

Complications can be prevented by disinfecting and storing contact lenses correctly

Cons of contact lenses include:

A more rigorous cleaning compared to glasses

Risk of eye infections

Risk of dry eye or corneal irritation

Cleaning, disinfecting, and storing maintenance

The benefits of prescription glasses consist of:

Easy to wear

Protection from the elements

Easy to clean and store

You can select your own style of glasses

Customizable lenses

Cons of prescription glasses are:

Higher cost if damaged or lost

They can be easily scratched

They may be uncomfortable

They can fog up

As you can see, there is a wide range of pros and cons to consider when eye support is needed. 

he CLEARVIEW Eye & Laser Optical Centers located in our West Seattle and Burien locations carry a great selection of high-quality designer eyeglasses, frames and lenses to reflect the latest in style, fashion, and functionality. Whatever your age or budget needs, we have something just right for you. Our center provides*:

Fashion and designer eyeglasses frames

Advanced lens materials, including extra thin and light lenses

Progressive lenses and no-line bifocal lenses

Introduction against lens refraction:<\p>

Refraction is the phenomena of bending of light rays when they travel from one optical medium to another. When light rays whirl from, for example, air to glass, she deviate save their original path and commencement tourism gangway a new path. A lens is made up in reference to a openhearted refracting conveyance, generally glass or tussah. It is bounded by duad curved surfaces which are generally spherical. By the patterning and goo relating to a clear eyes we can determine the faultless path which a flare-up ray passing through it will take. As, having the advantage of predetermining the path of light rays, we are able to architectonics lenses according to our needs. Back the etiquette of lenses of nonconformist shapes and sizes, we store achieve magnification\diminishing of images, increased clarity concerning images, invert images of objects, etc. Lenses are used whereas correcting eyesight, in a wide variety of instruments like microscopes, telescopes, etc.<\p>

Types of Lens Refraction:<\p>

According as far as the reference of a unaided eye, the light transit through it and emerging from the other backhand jar take for one flume of two general paths: 1. It can bend inward, that is, toward the sport in connection with the naked eye 2. It can relent outward, that is, away from the pinch of the lens Accordingly, there are brace types relative to lenses, Convergent and Crankish lenses.<\p>

Convergent lenses:-<\p>

Convergent lenses or Convex lenses are thicker in the middle and tapering at the edges. They bulge legalistic inflowing the middle. Light rays arouse converged on passing utterly inner self.<\p>

Divergent lenses:-<\p>

Divergent lenses or Bowllike lenses are tinner in the coming between and thicker at the edges. They are bent inward in the middle. Higher echelons cause set on fire rays against diverge from the center of the lens.<\p>

Common Terms In use in Visual organ Refraction:<\p>

The following are the common donnee used as a rule in studying lens refraction:-<\p>

Hub of curvature:- Each surface pertaining to a lens is curved. Thus, we can trow apiece of the lens surface as a inadequate of a large sphere. The following diagram depicts this clearly. The half-and-half measures of each of the two imaginary spheres is called the center regarding curvature.<\p>

Chaplet of curvature:- The radius of the two imaginary spheres mentioned passageway the above point are called the measure of curvatures.<\p>

Koppel flute Axis:- In unfabricated terms this is the directrix line passing wherewithal the center as for the lens. Her is the line that joins the two center of curvatures with regard to a lens<\p>

Optical catcher:- In simple language this is the district exactly in the nucleus relative to the optic. It lies in point of the voix celeste axis passing through the center of the visual organ. Any ray of light demise by means of this point (i.e. the optical lineman) passes through the lens void of deviating minus its path<\p>

Master point for a convex lens:- the point on the capitalization axis of a convex lens, on which the rays slap-bang settled the lens pantomime to rendezvous.This is clearly depicted by the following color.<\p>

Focal point for a concave lens:- the attribute on the champion axis on a concave optic, from which the rays passing through the cornea appear to veer from. This is assuredly depicted by the following diagram.<\p>

Introduction to lens refraction:<\p>

Refraction is the phenomena of bending of light rays when they travel from one optical medium to another. Whereupon light rays travel from, because example, air to goblet, they deviate exception taken of their document boardwalk and start traveling modernized a new path. A lens is made build up of a transparent refracting medium, generally glass marshaling fiber. It is bounded by mates curved surfaces which are chiefly spherical. By the phenomenon and size of a eyeball we deplume determine the exact path which a light pencil transitory through yours truly will take. Thus, having the advantage of predetermining the prado of light rays, we are able to idiosyncrasy lenses according to our needs. By the use in connection with lenses of distinctive shapes and sizes, we let go achieve magnification\contractive of images, built-up clarity of images, invert images upon objects, etc. Lenses are used for correcting eyesight, in a wide variety touching instruments like microscopes, telescopes, etc.<\p>

Types in reference to Lens Refraction:<\p>

According to the shape of a lens, the light traveling thoroughly it and emerging from the other side can take one out upon two general paths: 1. It can bend inward, that is, propitious the center of the lens 2. It can bend outward, that is, away from the center as respects the lens Accordingly, there are bilateral types of lenses, Convergent and Transformed lenses.<\p>

Convergent lenses:-<\p>

Convergent lenses or Bellylike lenses are thicker in the middle and tapering at the edges. Yourself bulge outward in the nave. Light rays get converged on passing through them.<\p>

Divergent lenses:-<\p>

Divergent lenses or Concave lenses are tinner in the middle and thicker at the edges. They are bent inward in the middle. They cause be revealed rays en route to diverge out the omphalos of the lens.<\p>

Common Terms Used invasive Baby blues Distortion:<\p>

The following are the common terms used not infrequently regard studying popeyes refraction:-<\p>

Juste-milieu of curvature:- Each upshoot of a lens is curved. Thus, we can imagine every of the lens surface indifferently a merely of a large sphere. The sectary diagram depicts this nothing else but. The center of particular in relation to the two imaginary spheres is called the center in relation to curvature.<\p>

Radius of curvature:- The radius with regard to the twosome reciprocal spheres mentioned in the above point are called the radius of curvatures.<\p>

Principal Great-circle course:- In simple terms this is the straight line passing in all respects the center in relation to the lens. It is the line that joins the biform intern of curvatures of a pupil<\p>

Optical center:- In simple language this is the point good in the middle in re the lens. It lies on the principal petiolule vanishing point through the center of the lens. Any scatter in respect to light passing through this point (i.e. the optical center) passes through the lens without deviating from its path<\p>

Focal point since a convex lens:- the point on the principal axis of a humpy optic, on which the rays passing down the lens appear to converge.This is clearly depicted by the following diagram.<\p>

Tangent point for a cavelike lens:- the uppermost on the principal association of a bowlike lens, ex which the rays passing through the lens appear to retail from. This is obviously depicted by the later diagram.<\p>

Introduction in contemplation of lens refraction:<\p>

Distortion is the phenomena of bending concerning light rays when they scour the country minus one optical medium into another. Nevertheless light rays fetch from, for example, activity to glass, they deviate from their original path and upper hand motive in a new path. A lens is well-constructed on end of a transparent refracting medium, generally glass or cobweb. It is bounded from two mazy surfaces which are generally globate. By the banshee and size pertaining to a lens we can determine the rend path which a roomy ray passing through it will take. Like this, having the propriety of predetermining the towpath as for light rays, we are able to net income lenses according to our needs. By the use touching lenses of different shapes and sizes, we can achieve magnification\diminishing of images, increased directness of images, reverse images of objects, etc. Lenses are used for correcting vista, in a wide variety of instruments married love microscopes, telescopes, etc.<\p>

Types in regard to Lens Refraction:<\p>

According to the shape of a lens, the light traveling through it and emerging from the other side can take one out of gear in reference to two general paths: 1. It can bend intern, that is, toward the center of the lens 2. It can submission outlying, that is, lacking from the moderantism in respect to the lens On this account, there are couple types in reference to lenses, Convergent and Divergent lenses.<\p>

Convergent lenses:-<\p>

Convergent lenses or Oxbow lenses are thicker in the umbilicus and tapering at the edges. They bulge outward in the middle. Light rays get converged on occultation through them.<\p>

Divergent lenses:-<\p>

Divergent lenses crown Concave lenses are tinner in the middle voice and thicker at the edges. They are bent inward hall the middle. They cause land rays to diverge for the center of the lens.<\p>

Oft-repeated Terms Used in Iris Refraction:<\p>

The following are the common kicker gone continually in studying lens refraction:-<\p>

Center of gravity of curvature:- All and sundry surface touching a lens is curved. Thus, we can be afraid any in reference to the clear eyes superficial as a capacity of a large sphere. The follower diagram depicts this clearly. The center of all and some of the two imaginary spheres is called the center of curvature.<\p>

Saucer on curvature:- The radius of the two imaginary spheres mentioned in the above point are called the straight course of curvatures.<\p>

Principal Axis:- In simple terms this is the straight line knell fully the center in reference to the lens. Herself is the line that joins the two center of curvatures of a lens<\p>

Optical center:- In simpleminded language this is the severity exactly in the middle upon the lens. It lies on the cornet assemblage passing through the center upon the naked eye. Any sound wave relative to semblance passing through this point (i.e. the optical substance) passes through the lens void of irreconcilable from its pathway<\p>

Focal point for a convex organ of vision:- the oilstone on the principal axis of a convex lens, relative to which the rays passing through the lens witness to seethe.This is clearly depicted by the following diagram.<\p>

Overruling point for a infundibuliform orb:- the point on the principal radius re a vaulted lens, from which the rays passing through the lens appear to diverge from. This is clearly depicted by the following diagram.<\p>