<prompt> True about keratoconus -Progressive thickening of scleraFleischer ring seenSoft contact lens not usedmyopia  <response>: Signs of Keratoconus. Following signs may be elicited:1. Window reflex is distoed.2. Placido disc examination shows irregularity ofthe circles Fig. 5.18B.3. Keratometry depicts extreme malalignment ofmires.4. Photokeratoscopy reveals distoion of circles.5. Slit lamp examination Fig. 5.18C may showthinning and ectasia of central cornea, opacity atthe apex and Fleischers ring at the base of cone,folds in Descemets and Bowmans membranes.Very fine, veical, deep stromal striae Vogt lineswhich disappear with external pressure on theglobe are peculiar feature.6. On retinoscopy a yawning reflex scissor reflexand high oblique or irregular astigmatism isobtained.7. On distant direct ophthalmoscopy an annulardark shadow due to total internal reflection oflight is seen which separates the central andperipheral areas of cornea oil droplet reflex.8. Munsons sign, i.e. localised bulging of lower lidwhen patient looks down is positive in late stages REF:Comprehensive ophthalmology,4th edition,pg no.119 