INSIGHT EYE CARE

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Identification of a lens - Convex lens - 1.  It is thick in the center and thin at margins.  2.  Convex lens is a magnifying lens, objects appear bigger in size.  3.  If we move a lens the image moves in opposite direction.  4.  It is denoted by PLUS(+)  sign 5.  It is used to correct hypermetropia and presbyopia.  Concave lens - 1.  It is thin in the center and thick at margins.  2.  It is a minifying lens, objects appear smaller in size.  3.  If we move a lens the image moves in same direction.  4.  It is denoted by MINUS(-)  sign.  5.  It is used to correct myopia.   ------------------------------------------------------------------------------- Both convex and concave lenses are of two types : 1. Spherical lens - i. Movement of images can be seen in all direction.  ii. If we rotate a lens, there is no distortion of image.  2. Cylindrical lens - i. Movement of image can be seen only in one direction, at right angle to it

Optical Axis A line passing through centre of cornea,  centre of lens and posterior pole of retina is the optical axis of eyeball. (ONA)  Visual Axis A line joining point of taxation with phobia and passing through nodal point of eyeball is called visual axis. Nodal point of eyeball is just anterior to posterior capsule of lens.  Fixation point is the point which is being seen with phobia at any particular moment. (VNF)  Pupillary Axis This is a straight line that passes through centre of pupil. (OPA)  Fixation Axis This is a straight line that joins centre of rotation of eyeball with fixation point. (VC)  ------------------------------------------------------------------------------- ANGLES - 1. Angle Alpha -  Is the angle formed between optical axis and visual axis that is angle (ONV)   2. Angle Kappa -   Is the angle formed between visual axis and pupillary axis. (OPV)  3. Angle Gamma -   Is the angle formed be