What is the role of contact lens examination?

summary

The contact lens is used to examine the posterior vitreous body and the posterior polar fundus on the optical axis of the eyeball. At present, Goldmann's flat concave contact lens is commonly used, which is composed of - 55 to - 60 diopters. Because the contact lens itself is not magnified, the magnification of the eyeground is equal to that of the microscope used, the eyeground is positive, and the reflected light is less when using, so it is easy to check. What is the role of contact lens examination?

What is the role of contact lens examination?

Normal: the retina is normal, the retina is transparent, because of the choroid and pigment epithelium layer, the fundus is uniform orange. There are also many choroidal pigment and enrich between the blood vessels, so that the red choroidal vessels revealed a leopard shaped fundus. Abnormal: abnormal results: after high myopia, retinal detachment, endophthalmitis or ocular trauma, posterior vitreous detachment often occurs.

The purpose of the contact lens is to examine the posterior vitreous body and the posterior polar fundus on the optical axis of the eyeball. Abnormal results: posterior vitreous detachment often occurs after high myopia, retinal detachment, endophthalmitis or ocular trauma. People to be examined: Patients with retinal abnormalities.

When the contact lens is placed, the patient puts the chin on the chin support, and the head is fixed. The examiner holds the contact lens with one hand and holds the control lever with the other hand. 2. Push the slit lamp microscope forward to make the focus move gradually from the corneal surface to the fundus until the fundus is clear.

matters needing attention

Unsuitable crowd: anesthesia, installation and other procedures, but also not suitable for postoperative, children and nervous people. Taboo before inspection: the instrument must be clean. Inspection requirements: as required.