On the contact script, you will see BC, which means base curve, which is the radius of the contact lens measured in mm. This tells us how steep or flat the curvature of the contact lens is Optical Center. If the lens is too steep for your eyes, it will be too tight. This prevents oxygen from getting into the eyes and causes complications. . If the contact lens is too flat. It will be too loose and cause excessive movement and fluctuating vision in the eye. So we need it right whether it’s for prescription contacts. Or non-prescription contact. Lenses. Die stands for diameter, which tells us how wide the contact lens is in mm. We want the diameter of the contact lens to cover the cornea and the clear front surface of the eyes. And we also want it to extend past it by a few mm. If the diameter of a lens is too small for you, then it doesn’t cover your cornea. Which then the edge of the lens can cause rubbing and damage to the cornea.
Optical Center Lens
The eye doctor assesses the fitting of the specific. Brand of lenses on your eyes to ensure the base curve and diameter of the lens. Are suitable for your eyes before prescribing them to you? , Glasses and contact lens prescriptions must have an expiry date to dispense. The end date may not be the same for both of them. This will determine by your eye doctor, taking your eye health and eye history into account. , And you should find the name and signature of your eye doctor on the prescription for it to be valid. Your eye doctor can give you a copy of your prescription. If you want a record of it. So that’s your prescription explained. If you liked this video and want to see more going through your common eye questions.
We will discuss optical design and aberration in optical systems. But, I did not want to make another boring article allotted aeration and I wanted to. I actually make something from stock parts that could test in the lab. So we’ll illustrate the topic by building a five-time magnification microscopy aim. Look. This is an actual image Taken with the microscope aim that we will build in this video. It is terrific, and the object is about one-millimeter diameter. Only okay, but let’s first start with the turn. Will then cover the assembly and testing of the aim. This is a conventional infinity-corrected microscope setter. There is an object, a microscopy aim, and the tube lamps’ light rays emerging from the object. Adam Koch, like aim and an image by the turbulence on the sense of play. The hero will focus only on the microscope aim.
This is due to spherical aberration. Which originates in the two large angles that the last ray is making with the land surface. The result of our collaboration is that the image will blur because of all the different traits. If different, focus positions. There are two ways to limit spherical aberration error.