Power of the prepupillary pseudophakos.

The Emmetropic and the Iseikonic Implant Lens: Computer Calculation of the Refractive Power and its Accuracy

“…The power read from the diagram should be adjusted with ± 1.5 dptr per ± 1 mm difference from 3.5 mm as will be shown below [cf. also Binkhorst 1972Binkhorst , 1973. The influence of measurement inaccuracy on the lens power and on the magnitude of the retinal image is demonstrated in figure 4.…”

Lens injury in children treated with irido-capsula supported intra-ocular lenses

“…We do not recommend intentional second-stage IOL implantation in all cases, as this is too time-consuming and favours amblyopia and squint. Contact lens correction has too low a success rate to justify this attitude (Binkhorst andGobin, 1964, 1967).…”

“…A protective eye shield with a central hole instead of an eye patch contributes to the reassurance of the child enormously. Not only can the child use his obtained vision immediately, it need not be worried through the hole (Binkhorst andGobin, 1964, 1967). Endotracheal general anesthesia may again be necessary at a later stage for the purpose of exami-270 nation or the determination of the refraction.…”

Computation of emmetropizing and iseikonizing implant lenses by means of a pocket calculator

“…Many authors have produced calculation schemes (8,12) and nomograms for the calculation of the emmetropizing power of implant lenses. The aniseikonia produced by an emmetropizing implant lens in a schematic eye (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) is in the order of 4%. Considerably higher amounts of aniseikonia are to be expected in case of ametropia due to an axial length difference between the eyes.…”

“…The average sound velocity being 1530 m/sec a depth of 30.6 mm will correspond to this time. The correction factor for the pictures then will be: now accepts distance measured in mm from the pictures and calculates the dimensions by using(1). These dimensions are found in millimeters, so the used indices of refraction are multiplied by 1,000 in order to get valid calculations.…”