<prompt> Keratometry is useful in measuringCorneal curvatureCorneal thicknessCorneal diameterDepth of anterior chamber  <response>: A i.e. Corneal curvature Keratometry or opthalmometry is objective method of estimating the corneal astigmatism by measuring curvature of cornea Q. Its readings are not of much value in routine refraction for prescribing glasses but are of utmost value for prescribing, contact lens and for calculating the power of intraocular lens to be implanted. Examination Done by Corneal thickness Patchymeter Corneal endothelium the normal cell density is r.:., 3000-4000 cellsmm 2 Specular microscope Corneal curvature Keratometer Q Corneal sheen shining or polish Placidos disc examination there is loss of sharpness of the outline of image of circles Corneal surface Placidos disc, window reflex, slit lamp biomicroscopy Corneal staining Fluorescein stain: corneal ulcer is stained brilliant green. Alcian blue: stains excess mucus selectively Bengal rose 1 with Xylocaine 2: stain diseased devitalized cells red 